Shocking service by Groupon when refunding monies

I purchased a carpet from Groupon on 14 September '15 and paid via EFT to which my account was debited immediately. After 3 weeks, I still had not received my carpet nor had I received any call to say there was a problem. I called to find out what was happening, to be told that the special had already ended and they would refund my money. I did not want a refund, but wanted my carpet. I then wanted to speak to the manager who would not speak to me, but later sent an email to say they needed my banking details with a bank statement in PDF in order to process the refund. After a number of calls and emails, I am still waiting for my refund, and keep getting told that they are working on it. I have never received such disgusting service in my life before.