Product: Credit card

I began sending my payments to Capital One by endorsing the remittance coupon on the bottom of my billing statement. Prior to endorsing the bill, I contacted in writing, the CFO of Capital One, XXXX XXXX, as agent of behalf of the principal, accepting all rights, all titles, all interest and all guaranteed equity owed to the principal of the account and instructing XXXX XXXX XXXX to apply the principal 's balance of {$6300.00} to the principal 's account and to accept the tender of payment. In this letter, I also stated that if there were any discrepancies, that he should respond in writing within 5 business days of receipt and if there was no communication, I could assume that the aforesaid instructions had been completed. Many days later, I sent a second letter to XXXX XXXX XXXX as an opportunity to cure, expressing the same acceptance of all titles, all rights, all interest and all guaranteed equity to the principal and to apply the principal 's balance to the principal 's account and that he should respond within 5 business days or receipt if there were any discrepancies and again, that if there was no communication, that I could assume he had completed the instructions given. I had received confirmation by certified mail that the letters sent to CFO XXXX XXXX had been received. I did not receive anything in return from CFO of Capital One XXXX XXXX, so as stated in the letters sent to him, I assumed that the instructions given had been completed. On XX/XX/2023, days after sending my first endorsed bill, I tried to make a purchase using my Capital One card, which still had an available credit balance from the precious debit payment that was made on the account from the previous month and my card was declined. When I called Capital One to inquire why my card had been declined, the representative that I spoke to, told me that my account was closed on XX/XX/2023 because of the instructions that were written on the remittance coupon. Days later I received a letter in the mail from Capital One stating that my account had been closed because " activity on this or another account is not consistent with our expectations for account usage and violates the Capital One Customer Agreement '' and that I would still have to make payments on said closed account. I also received a letter from Capital One saying that they had removed my name and address from future Capital One credit offers. I asked Capital One for full disclosure of the account including a copy of the original contract for the account and the sent me a copy of their Customer Agreement which reads under subsection " Making Payments '', " Your payments must be made in U.S dollars from a U.S account in a form acceptable to us. We do not accept cash payments through the mail. You may not make payments with funds from your account or any other credit account with us or any other company in the Capital One organization. You must send mailed payments to us as instructed on your statement unless we tell you otherwise ''. I believe that Capital One is discriminating against me by not allowing me to endorse my bill using a bill of exchange, which is applicable by law under the Bill of Exchange Act as well as by removing my information prohibiting me from being able to obtain any credit through Capital One, which if a violation of the Equal Credit Opportunity Act.