2 Months waiting for a refund on defective product

I received a defective product through a groupon promotion. The process to get my refund has been one of headache and tears. They said I would receive it in 7-10 working days. It has now almost been 2 months and I still have not received anything. Attempts to contact their customer support just ends in replies every 2 weeks with a short sentence which says I should check my account for the money. They are pathetic and I hope this complaint actually does something!