Undelivered goods

I bought a Velcro waist trainer on 8 October 2015 and paid via Eft. I sent proof of payment to Groupon on the very same day. It's now 18 November and I am still waiting. I made endless telephone calls and sent emails. No one is giving me answers and I am being sent from pillar to post. They were quick to take my money and now they are ignoring me. All I want is my order failure to that I want my money back. They do not care about their customers all that they are interested in is your money. I am so disappointed and very upset with this kind of treatment