Now many banks prohibit the use of credit money for the purchase of cryptocurrency. Did you buy bitcoin for your personal money or for bank money (credit)? When using personal funds, you should not have any problems. Cancel the ban on double conversion if your national currency is not a dollar or an euro. Also, you did not specify which country you are from, so it's hard for you to give an answer. In all countries, completely different attitudes toward cryptocurrencies and bitcoin.
I wouldnt even really advocate for the purchase of bitcoins with credit cards considering how much they charge for that transaction, you could purchase a lot of gift cards which you can exchange on paxful an exchange agency.