if I understood your problem correctly your fiat transactions are being rejected! that is a problem that you should take up with your bank and the service you are trying to use and buy bitcoin from. there is nothing we can do for you.
Yes they are fiat transactions. I've already spoken with my they say there isn't a problem on their side & my card is fine. I cannot get a response from blockchain. I've tried multiple times.
I joined this forum to see if others have had the same problem and if they found a solution.