GROUPON CANT GIVE ME AN ANSWER!!!!

After trying to repeatedly purchase an item on Groupon and getting confirmation that it has been done, Groupon has continuously cancelled my order over and over ....even after contacting numerous amounts of groupon agents not one of them are able to tell me what to do or how to move forward in the correct direction... how is it that one of the biggest online shopping agents only accept U.S credit cards???? Never mind the fact that I use my paypal account to pay in dollars and still i received nothing??? .... as I still want to purchase the course let's hope groupon will contact me now!!!!