I bought a set of these ROTORS and some EBC green stuff pads from you guys a few months back. And these rotors are already warped quite bad. I get a serious vibration when braking from light to moderately. What I'm wandering is, is there any kind of warranty on these things? I had a set of EBC rotors last me 80K miles with barely any warping or vibration at all and I've had these for a tick over 4K and it's to the point where it's worrying to drive. These were installed by a professional mechanic aswell so it's not like I screwed something. Is there anything I can do about this? I really don't think machining them will solve anything permanently as they will just warp again and possibly worse cause they would be thinner. Can you help me any?