Integra(Theo) refuses to repair vehicle.

I bought a Jeep Cherokee from Integra Motors Centurion on the 10th of November 2015. We received the vehicle a few days later than agreed because they could not perform the road worthy checks on time. Within a week, the vehicle started to leak oil, which we reported back to Integra within the same week of collecting the vehicle. We have been struggling since November to get the vehicle booked in for checks and when they finally managed to book in for checkup(19 Jan 2016), they found that the oli leak has subsequently damaged the turbo. Theo at Integra is insisting that they gave the vehicle to us in good condition and we damaged the turbo ourselves. They even went as far as lodging a claim through our warranty without our consent to try and repair the damaged turbo. The turbo was a result of an oil leak which was reported to Integra within a week of receiving the car. Why should we pay for the damages. The car is still not registered to us, and not licensed, since November. Spare keys are still not delivered to us. Theo is refusing to pay for the vehicle repairs. This need to be sorted.