Poor Communication and Overall Bad Service

I ordered a tablet from groupon's online promotions and paid in December. After weeks of not receiving the parcel and my emails not being responded to except for the automated email notification stating that a consultant would contact me within a certain period which did not happen. I followed up through their facebook link to find out what was happening and was advised that the product was out of stock. I then requested a refund as there was nothing of interest to me on promotion. I was advised that the refund would take 10 days. After the 10 days lapsed I followed up again and was advised that the refund had bounced back and I should wait an additional 5-7 days. My concern is that the refund will still bounce back as my banking details have not been confirmed considering that their initial attempt to refund me. The most annoying thing is having to use my resources to follow up on a query which the company should be updating me following their error. What happened to good customer service???