You still had their product for 4 months. Personally, I wouldn't have even bothered contacting them about returning them. I would have kept them for future use, or sold them on Ebay. And, I think being charged 15% restocking fee for you having them that long is more than fair. Do you have any idea how many companies would have told you to get bent? Sorry, but IMHO, you don't have a leg to stand on.