Product: Debt collection

I would like to raise complaint against XXXX for following avoidable event 1. fraudulent billing practices to charge their customers excessive amount by giving misleading statements about their billing cycles ( payment made in concurrent month before billing cycle ends but claim that payment is made in arrears ) 2. not capturing accurate payment details against the account ( first month payment made via XXXX XXXX could not be found by customer service rep in Payment history ) 3. Not sending a final settlement bill if money was owed, explaining what it was owed for with a supporting detailed bill 4. Sending unnecessary delinquency notices after 4 months of quitting their network.

5. Using a Debt collector - Frontline Asset Strategies who is towing XXXX 's line and not shown any intent of course correcting, reviewing the facts and resolving the matter amicably. They just don't want to listen what you have to say! Not even look at the evidence you provide! Extremely rude by not letting you speak up despite telling them that you dispute the bill. 
Below are some details timeline wise XX/XX/XXXX - Joined XXXX XXXX XX/XX/XXXX - Left XXXX XXXX XX/XX/XXXX - XXXX sent an outstanding bill of {$260.00} for past due of payments. So, I called their customer service at XXXX XXXX  to provide proof of what is this amount due for. They mentioned I did not pay for billing period XX/XX/XXXX to XX/XX/XXXX. I told the agent that I left XXXX network on XX/XX/XXXX and the same day lost access to my account login as well as all phone service to my 3 phone lines effective immediately after porting my primary line to another carrier. I asked them why XXXX did not send me a final settlement bill if I owed them money and now sending notices of delinquent payment. I also requested for copy of final settlement bill ( XXXX to XXXX with detailed break up ) which they never sent. The next I received was collection notice. 
XXXX - XXXX - Received debt collection notice of {$260.00} owed to XXXX  from debt collection agency - Frontline Asset Strategies XX/XX/XXXX - I spoke to debt collectors to understand what this debt is about and the response I received was that I have not paid last month 's bill ( XX/XX/XXXX ) of {$110.00} when I left their network and subsequently my account went delinquent and extra charges were added to the bill. I explained them that I had paid the last month bill ( XX/XX/XXXX to XX/XX/XXXX ) on XX/XX/XXXX via XXXX XXXX. The response was that " XXXX collects payments in arrears '' and this payment was for month of XXXX and not XXXX. I told them that I dispute this bill and also the statement you just made as I have been paying XXXX bills in the concurrent month via Autopayments which can be easily verified in the payment history. But, the debt collector representative refused to listen to this counter argument and did not let me speak nor did she explain the process of disputing the bill and how I can get this resolved. She just kept saying I need to pay the money as per XXXX XXXX notice. I sent them a document with proof of payments made to XXXX with my explanations. 
XX/XX/XXXX - Called XXXX to resolve confusion after learning the details from debt XXXX about their billing practice in arrears. I went through my payment details starting the day I joined their network to the day I left ( 4 billing cycles and 4 payments made ). The XXXX  representative was not able to trace my first payment of {$140.00} in the billing history after going over the details. He acknowledged the issue but said it can not be updated in their system as this has already gone to debt collection agency. I requested to talk to the supervisor if he/ she has higher privileges to help update the payment history. The supervisor said nothing can be done about this and the matter can only be resolved via debt collection agency now. So, I created a detailed document of my payment history and sent to the debt collection agency. Also, sent a formal letter to record that this transaction is disputed. 
XXXX XXXX - Spoke to Debt Collection agency and was told that they will send the final settlement bill shared by XXXX and again repeated that " XXXX collects payments in arrears '' ( meaning next month ). Despite sharing all proof, I dont think that the debt collection agency has any incentive to resolve this matter in customer 's favour. Nor do I think that XXXX wants to correct this billing discrepancy at their end.