Topcat

Hi bought a 2011 bmw took it for a test drive I asked dealer I could hear a noise coming from under the car he told me it's the air conditioning //lol I asked him to sort out the noise and I will buy it he called me back and told me it was the discs and renewed them all I gave him the cash got a 3 month warranty drove off to find the noise was still there it's now 3 months later and he's still trying to get out of repairing the back differential saying if he fixed the differential and the noise is still there he will not fix it again so he wants me to sign a form that I can't recall him to put it right