How to Get Off a Credit Card

I've been experiencing the past three four days with big box online retailers. The first is best by tried to place an online order by paying with two different credit cards, both times the order got canceled. I called the customer service department who told me there's a block on my account in the back end no other information was available. There also is more of a problem with debit cards which are riskier than credit cards but sometimes location of where you are makes the difference in whether a debit card goes through and that may be the case for credit cards too.