Car deal gone wrong

On the week of the 12th of December my husband bought a car from Imperial Select in George. The car came from George to cape town. on more than one occasion the rep told my husband that if he wasnt happy with the car, they would void the deal. THe car arrived for delivery on saturday and my husband saw the service book. The last service was not done at an agent, rendering the warranty (of which my husband took an extended plan, with service plan) void. At that stage my husband requested they bring his pristine car back and take their car back. The Sales manager then called and promised my husband all the documentation to prove that his car is still under warranty. In the meantime my husband has consulted with dealer principles at more than one Hyundai who have emphatically stated that the cars not showing any services after 60000 on their system. The garage now maintains that its all fine and is avoiding calls. we just want our car back and for the deal to be cancelled based on breach of contract. We also bought the car with 83000km on and it arrived with 87000km. The garage is now avoiding us despite numerous attempts to contact them, they are dragging this out. we know our rights in terms of CPA and at their instance they said they would return our car which they are now keeping.