Failure to Refund Defective Goods

I purchased a refurbished tablet on 22 September 2015 and it was delivered within 2 weeks. When I opened the item it was defective. It didn't respond when I tapped on the icons. It didn't even want to switch off, as you have to tap on the \Power Off"button for it to switch off. <br> <br> I've contacted Groupon via email on 5 October 2015 regarding the defective item and that I would like to return it for a refund. I received an email asking me to log my return online. I tried to do this"