I was sent an offer letter to collect a debt resulting from checking account bank fees related to a closed account with XXXX. I did not have time to verify the debt but paid it given based on the offer to reduce the debt with XXXX payments of {$64.00} ( {$320.00} total ). I paid {$65.00} x XXXX times and {$63.00} for the last payment ( totaled {$320.00} ). However, the collection agency did not acknowledge the offer they made and wanted to collect the entire balance of {$800.00}. I sent XXXX requests to acknowledge that I accepted the offer with the last XXXX payments but did not receive any response.