In XXXX 2013 I entered into an agreement to make monthly payments to P & B Capital for a debt from XXXX credit card that had been charged off on XXXX/XXXX/2013 in the amount of {$1600.00}. I was told by the collector that XXXX XXXX had purchased the charge off and sent the account to P & B Capital. My first payment began XXXX XXXX, 2013 in the amount of {$67.00}. My payment were monthly till XXXX of this year. I tried to contact the number I had written down when I entered the agreement in 2013, but was not able to reach anyone after I calculated I only had XXXX payment remaining. I received my first phone message to call the collection agency XXXX XXXX to discuss the missed payment. I called the collector on XXXX XXXX in the morning and was told that since I failed to make the final payment the agreement was now void and I owed {$600.00}. I was told by the collector that my payment had been returned. I told them I had not been notified by my bank there was a problem with the payment. I also communicated that no one contacted me to try to resolve the issue until now. After work on XXXX, I contacted my bank and was told that there was no attempt by P & B Capital to collect the final payment in XXXX. I feel that this is a " bait and switch '' tactic to collect more money from me. I called P & B and spoke with a floor manager after I called the bank and was told it was not returned by my bank, but by their system. I asked why they did not rerun the ACH since it was an error on their end. Was told company policy does not allow them to rerun if it was returned. Their policy is in place when there are insufficient funds as are majority of companies that run ACH transactions. This was not the issue, and I wondering if the transaction even was run at all since they knew it would be in default if the payment was missed. I asked them to work with the creditor who placed the debt to settle for the final last payment of the agreement, and I am waiting for a reply. However, I am under the impression that they will not agree after this mornings conversation they would only settle for half of the new debt amount. 
All I want resolved is my final payment to be taken in the amount of {$67.00} and for the debt to marked as paid. I refuse to pay more money to an agency who does not send out letters to collect and does not call. If they did call when I was at work they did not leave a message for me to call, so I have no idea if they did call or not.