Product: Debt collection

My contract with XXXX XXXX ended XX/XX/2016. XXXX withdrew {$670.00} on XXXX/XXXX/2016 which was for the final bill. XXXX failed to provide me with a final bill to support the charges. I have made several attempts to obtain a copy of final bill by calling customer care and walked into XXXX store, and each time I called, I was promised that I will receive a bill within 7 to 10 business day. but no luck. I waited for a copy of the bill from XXXX/XXXX/2016 to XXXX/XXXX/2016. Meanwhile, I called my credit card company and filed a dispute against XXXX for failure to provide me with a bill. I received a conditional credit for {$670.00} on XXXX/XXXX/2016. On XXXX/XXXX/2016, as evidenced with a post mark, XXXX XXXX mailed a copy of the final bill. I called my credit card company and requested to remove the dispute and credit back XXXX the funds since I have received the final bill. On XXXX/XXXX/2016, {$670.00} was reversed back to XXXX. the reference # XXXX. Meanwhile, I received a letter from Convergent Outsourcing Inc. XXXX XXXX XXXX XXXX WA XXXX. contact # XXXX on XXXX/XXXX/2016, a collection agency collecting on behalf of XXXX requesting full payment of {$670.00}. On XXXX/XXXX/2016, I called, and explained that I do not owe XXXX, and the full amount was paid in full, and that I have proof. I gave the representative the amount paid, date, and reference number. The representative stated that she will put the account in dispute and forward the information to the creditor ( XXXX ). I waited. on XXXX/XXXX/2016, i received a second letter from Convergent stating that the debt is valid and the account is due in full. I called again on XXXX/XXXX/2016, and spoke to the Representative, and advised i have all the credit card statements and the final bill to prove that I do n't owe the debt. The Representative acted in an unprofessional, and rude manner, and continued to state that i owed the debt. I explained to her that i can mail her the information to prove otherwise, however, she refused. I asked to speak to her supervisor and no luck. I repeated the story, and advised what do i need to do to clear my name. I was told by the supervisor, to contact XXXX and speak to customer care. i advised that I 'm not having any successes with that, every time i call XXXX I 'm speaking to a different country and they state they will investigate and call me back but, they never call back. The supervisor ended the call by requesting that i do her job and contact XXXX to ask for bill and investigate the payment, and that the account will remain in dispute. i called XXXX the same day and spoke to XXXX ( from XXXX ). i repeated the story.. she advised that the last payment received was XX/XX/XXXX but was reversed on XXXX XXXX. I explained that 's not true, and that i have the credit card statement to prove otherwise. On XXXX/XXXX/2016, i walked into a XXXX store and explained to the Rep the situation and showed him the credit card statements. He then contacted XXXX and they were unable to help. XXXX is persisting that I owe the dent, and that the credit was reversed back to me on XXXX/XXXX/2016. However, if you investigate the statements attached, its very clear the credit was never reversed back as a credit after the initial credit of XXXX/XXXX/16. This is why I 'm filing the complaint. I 'm being harassed daily and my credit history is now in jeopardy. I need your assistance to resolving this matter. I have all the documentation needed to support my claim.