Billing

I have been using the same credit card on auto pay every month for my Zoom Pro account, but last December and January , my payment history showed unpaid , but in February I decided to use my card and pay since the system was not auto deducting. The past payment was cleared but now i cannot make a new payment for the month of feb. I tried my card again but it showed error. I used someone else s card and the payment was done but within 24 hours my money was credited and I am on my basic plan again. I have mailed them and they have refreshed my account but my card is still declined when i am trying to pay for upgrading. please help