Sounds like a letter they send to shoplifters. If you "google" the number 800-236-7428 you will find many instances involving this. If it is not you, they may have an error in your social security number or driver license number, which they got from the true defendant.
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I agree with my colleague.
I would add that if you have not had any adverse dealings with Walmart (particularly shoplifting), you may consider calling the attorney mentioned in the letter to inform them of the mistake.
Be aware that talking to an adverse attorney without an attorney of your own can be dangerous, so you should strongly consider having a local attorney make this call for you.
However, not making the call could leave the other attorney to continue pursuing a claim against you and the next paper you receive could be served to you by a Sheriff Deputy.