Epoch — my credit card keeps getting declined

I put in my information on my prepaid card, and no matter how many times I put it in it keeps being declined even if it was the right information! I have stuck with a prepaid card for a long time and this happened every time I try to buy something off of their service. And every time I see: "Credit card has been declined. Please make sure information is correct." I know I've put in the correct information because I had my card with me. Can someone tell me what is going on?