Hostgator showing error on paying with UBL debit card

I have got an error while paying to hostgator with ubl debit master card. Internet session was activated and added all details on payment page of hostgator, but hostgator showing an error message as under:
“We were unable to process your payment. Please try a different credit card or payment method, or contact our support staff for assistance.”
Previously I have made payment with same card to hostgator 2-3 times but now it is not working.
Hostgator support staff saying contact to your bank and ubl customer center representative saying its not our issue.
Can any one help me in this matter.