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Allstate Insurance Agency
Diamond Insurance Solutions, Inc.Matteson, IL

Office Hours

Day of the WeekHours
Mon9:00 AM - 6:00 PM
Tue9:00 AM - 6:00 PM
Wed9:00 AM - 6:00 PM
Thu9:00 AM - 6:00 PM
Fri9:00 AM - 5:00 PM
SatAvailable by appointment
After-hours appointments available.
Available 24/7 at

4330 Lincoln Hwy
Matteson, IL 60443


On Lincoln Highway behind LA Fitness

Areas Served

Chicago, Matteson, Chicago Heights, Frankfort, Tinley Park, Mokena
Diamond Insurance Solutions, Inc.: Allstate Insurance

Local Allstate Agency: Meet Diamond Insurance Solutions, Inc.

I’ve lived in the Matteson community for six years. I am a proud alumni of Illinois State University. Before coming to Allstate, I worked in corporate management and customer relationships within the insurance industry for fifteen years. I am passionate about educating and helping customers understand different aspects of insurance.

Being involved in our community is very important to me. As a result, I work on weekends as support staff at Mercy Home for Boys & Girls in Chicago. I believe in reaching out to the youth in order to help them build the confidence and skills they need to have successful futures. I am also a member of the Matteson area Chamber of Commerce, Chamber 57. I am a proud member of Kappa Alpha Psi Fraternity, Inc., currently serving on the Board of Directors for the Richton Park Kappa Alpha Alumni Chapter, in addition to serving as the Undergraduate Chapter Mendo for the Kappa Alpha Chapter (Illinois State University).

At the Diamond Insurance Solutions Agency, we believe that life is much more meaningful & fulfilling when one is able to impact the lives of others in a positive & unforgettable way.

You are valuable to us, & your relationship is precious. You are not just a number; therefore, we treat you with the ultimate level of care, respect, compassion, & service.

Your problem is our problem. We help provide simple solutions to sometimes complex protection issues. We aid your restoration after the unexpected. We help you protect what matters to your life: cars, property, assets, & most importantly....your family.

Products we offer:

  • Auto
  • Home
  • Condo
  • Renters
  • Motorcycle
  • Business
  • Life
  • ATV
  • Boat
Years of
Years in the
Education dropdown expand/collapse
Bachelor of Science-Illinois State University
Community Involvement
Community Involvement dropdown expand/collapse
Aglow International Matteson Single Moms - Winter Coat Drive
Heartland Blood Center - Sickle Cell Month Blood Drive

Our team

Brandon A. Robertson

Agency Owner

Charles Tweedle

Office Manager
Hello, my name is Charles Tweedle. I have a bachelor's in Business Marketing from Illinois State University. (Go Red Birds!) I have 7 years of Allstate experience including call center inbound, outbound as well as Allstate's corporate office working with the Allstate Independent Agencies (AIA) department. When I am not in the office, I enjoy playing chess, discussing philosophy, & watching sports.

Cornell Wiley

Customer Solutions Consultant
I am Cornell. In the fall of 2017, I became a Life Insurance agent where I helped to protect many families from the financial ruin of being unprepared for the inevitable. Now, as a member of Diamond Insurance Solutions, I pride myself on being able to help customers to cover their assets. In my spare time, I moonlight as a licensed barber. I am also Black Belt in Shorin Ryu Karate.

Kimberly Cosey

Customer Solutions Consultant
Kim is customer representative with over ten years of insurance industry experience; including sales, customer service and assisting customers with strategic long and short-term goals. Her goal is to help you create solutions tailored to individual needs while maintaining overall customer satisfaction.
She received her undergraduate degree from Illinois State University and master’s degree from Lewis University with a concentration in Organizational Leadership.
In her spare time, she enjoys spending time with her family and friends, binge watching Netflix, volunteering and sitting on the board of the non-for-profit Daughters Delivered by Grace. Kimberly also enjoys writing and is a collaborating author of the cross generational book Grace.

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Frequently Asked Questions
What are your agency hours?
Monday: 9:00 AM - 6:00 PM
Tuesday: 9:00 AM - 6:00 PM
Wednesday: 9:00 AM - 6:00 PM
Thursday: 9:00 AM - 6:00 PM
Friday: 9:00 AM - 5:00 PM
Sunday: Closed
Are you open on weekends?
Sunday: Closed
Can I text your agency with questions?
No, we do not have text messaging services.
What languages do you speak?
We have staff members available who speak the following languages: English
Do you have more than one location?
No, this is our only location.
Diamond Insurance Solutions, Inc. is insurance licensed in the state(s) of Illinois. If you do not reside in the state(s) of Illinois, please go to the Find an Agent section on to search for another Allstate Agent or Personal Financial Representative.

Based on coverages selected. Subject to terms, conditions, availability & qualifications.

This material is intended for educational purposes only. Auto and homeowners insurance, and other property and casualty insurance products, are available from Allstate Insurance Company, Allstate Indemnity Company, Allstate Property and Casualty Insurance Company and Allstate Fire and Casualty Insurance Company (Home Offices: Northbrook, IL); Allstate New Jersey Insurance Company and Allstate New Jersey Property and Casualty Insurance Company (Home Offices: Bridgewater, NJ); and Allstate County Mutual Insurance Company and Allstate Texas Lloyd's (Home Offices: Irving, TX). Life insurance issued by Allstate Life Insurance Company: Northbrook, IL; and American Heritage Life Insurance Company: Jacksonville, FL. In New York, Allstate Life Insurance Company of New York: Hauppauge, NY.