Groupon does not reply to queries

Someone **********ly used my bank card on Groupon's website and processed a transaction. I tried contacting Groupon through their website 2 days in a row. The website says they usually reply within 24 hrs, they have yet to reply 3 days later. I find it unacceptable that they have not rep**** to my plea for them to contact me. All I want is someone from that company to speak to me and help me get my money back.<br> It is kind of **** that they do not have a call centre or some contact number.<br> I've never used Groupon and I doubt I ever will. It cannot be this hard to contact a company for service.