<prompt> Human: Basically, I left t-mobile a while back. I had a month to month plan. Even kept copies of it. Decided to switch to another mobile company, let them know at the end of the month didnt want to continue service.Things are going fine, then a month later get a call from their collections department saying I owed 220 for early termination fee. I pointed out to them I was on a month to month plan, not the 2 year contract they claimed I sign; even faxed a copy of the contract I signed. They apologized and I didnt get any calls after that.A month after that this month Im now getting calls from collection agencies, specifically RPM, saying I owed t-mobile money. I pointed out to them again that I was on a month to month plan, not the 2 year contract they claimed, and they asked me to file a letter of dispute.Ive filled out 4 letters of dispute far, and Im still getting calls from different area codes, all saying they represent RPM.I havent gotten a copy of my recent credit score, but I already know this is going to hurt it. Is there anything I can really do? Already threatened them by saying how I filed a letter of dispute, this is harassment. Already provided documented evidence that I did not have a 2 year contract, and that there were no early termination fees.Nothing is helping, they are still hounding me. I was looking to possible consider a loan in 2-3 years for me and my girlfriend to get a house, but this will probably kill those dreams.Edit: Im reading the section on collections by the Automod. Hopefully this will help me.  <response>: Here is what I did when a creditor was in the wrong:1. State that all communication must be in writing to your postal address.2. Request a debt verification via certified mail. See the FRCA Section 6112. When the debt verification is produced respond disputing the charge with your documentation via certified mail. I would also ask to have verification provided that the charge has been removed from your credit report. See FRCA Section 623My letters were very strongly worded and I referenced the applicable sub-paragraph for each of my statements. I am requesting debt verification in accordance with FRCA Section... After 30 days I did have to send a letter evoking the furnisher clause of the FRCA, but it was immediately removed from my credit afterwards. 