Purchasing Problem

So, I went to purchase a year subscription to Harmony, but when i went to place my order, it told me it could not process the order. Maybe i typed in something wrong right? Nope. I absolutley made sure the information was correct with no typos. I even contacted my bank and made sure everything was alright and it was. I have no idea why my card would not work. Does anybody know why the website wouldn’t allow me to buy this?