No delivery, terrible customer service

A car vacuum cleaner was advertised on Groupon, and I bought it on 22 December 2015. To this day, I have not received it. They advertise their customer care email address, and promise to respond within 24 hours. I sent an email to enquire, and this was not responded to. I ended up calling three times, and waiting for about 15 minutes for my call to be attended to. I spoke to a consultant who promised to follow up and track the order for me, but she never did. The second time, still after waiting for long, Tanya answered and said she would follow up and track, and get back to me within 48 hours. She never did. When I called the third time, still held for a long time, and Tanya still said she would follow up and track. I told her that was what she had said the previous time, and it's only then that she checked and found out the vacuum cleaner was \out-of-stock\" and I was to be refunded. She promised to process my refund on Monday, 01 February 2016. I am still waiting. And on the website it says my order failed because my credit card failed! I have proof that the payment went through. Groupon is a waste of my money. I dont see the point of supporting them anymore. Give my money back!"