credit card refund

I booked a special under account [Email Removed] using my credit card and the money went through.<br> <br> i have asked for my refund but groupon is refusing with it. Proof of payment was sent to them ,stamped by the bank and the bank confirmed funds leaving tje account<br> this is an amountnor R1550 and i want it back to my cr card, detaills are on tje document sent to groupon