Car deal that went sour in 7months

Hello Peter I've bought an second hand Audi a3 last year November ever since then I've been having problems with this car it has been to the mechanic 6th time now and I've been given 24months warranty but now they don't want to pay the mechanic and the car has more problems of which I can't pay for them and owner of the dealership doesn't want to hear anything from me what should I do