<prompt> Human: Backstory:As late as the middle of last month, I have been receiving bills asking for payment of an unrecovered equipment fee. I stopped service in July. I forgot to return a modem until September college household, old roommate bought his own modem and I assumed the one we were using up till the end was still his, I admit fault on this, and was told that the fee would be dropped as soon as it was returned. I returned it. I have talked to customer service at least three times. When I talk to them, all they can see is a credit to the account because I discontinued service before the end of a billing cycle. On the bill, I am seeing the credit they talk about as applied to the original fee, with a remaining balance I still owe of around 90. I have asked for a dated letter in writing that I do not owe them money. They sidestepped this request this morning and said they would put a note on the account to send out the credit.Question: I dont want this to go to a collection agency, because I dont actually owe any money. Do I have any options? Right now I have the most recent bill from January and our most recent chat log from this morning. What can I do to prevent this from harming my credit?  <response>: I hope you still have the receipt that shows you returned the equipment. Ive seen multiple cases of TWC or Comcast pulling this type of behavior many, many times before. 