Refunding + false advertising

My sister bought a Swag tablet for me as a Christmas gift from Groupon. It is advertised as an android jellybean tablet (which can call, sms, whatsapp etc.) - as can be seen on the display picture on the adverti*****t (which displays all the android icons). When I finally received it for Christmas we found out that the tablet can't do any of the above mentioned things, and the interface was totally different than advertised. <br> I called Groupon about this and they said it was fine, they understand and will refund me, they fetched the tablet after about 5 phone calls further. Now the tablet is in Cape Town and they are telling me I can't refund, because there is nothing faulty with the tablet. I asked to speak to management and no one has contacted me as if yet (after I phoned twice to speak to them). According to me this is misrepresentation on a substantial aspect of why one buys a tablet in the first place (because I can't phone or sms etc.)<br> I am very disappointed in the way they handled my queries (or rather didn't handle it). I WILL NEVER BUY FROM THEM AGAIN, as this is not the first time that we had problems with refunding.