Dissatisfied

We are so disappointed my dad bought a car last year November and within 6 months he started experiencing problems,we tried communicating with the company but they couldn't help us they kept giving us the ran around...in August this year they found us a mechanic who they said will fix the car and the warranty will cover but then my dad received invoice from the mechanic worth R20000 my dad paid it 2 weeks back and got the car back but now the car is not drivable...he is paying for the car that he cannot drive and the auto city manager,sales person and the mechanic blocked him