Enterprise Recovery Systems , Inc . 
XXXX XXXX XXXX, IL XXXX : ERS Account # XXXXDear ERS/XXXX XXXX, I am responding to your contact about collecting a debt. You contacted me by mail dated XXXX XXXX, XXXXand identified the debt as XXXX. I do not have any responsibility for the debt you 're trying to collect. 
If you have good reason to believe that I am responsible for XXXX of debt owed to you, mail me the documents that makeyou believe that. Stop all other communication with me and with this address, and record that I dispute having any obligation for this debt. If you stop your collection of this debt, and forward or return it to another company, please indicate to them that it is disputed. If you report it to a credit bureau ( or have already done so ), also report that the debt is disputed. 

Thank you for your cooperation. Sincerely, XXXX