Having bought a gearbox for £270 it turns out to be faulty. The guy I bought it from ( won't mention any names ), has promised me another gearbox, after a couple of weeks waiting he said he can't get any at the moment, I've found another gearbox but can't afford another £200 , this guy won't reply to my message or my phone calls, where do I stand regarding a refund of some sort ? , thanks