Despicable service and unethical behaviour

We purchased a 12 month old car for 450000 from this branch. We found faults in the car and returned to a different bissan dealership. The problem persisted. They have now given us an invoice for 30 000 to repair something that they claimw e modified the vehicle which they have sold us. This means that they sold us a vehicle which had been tampered with. They have accused us eprosnally of tampering with the vehicle without check the service history at other branches