Car Avenue car dealership

They gave me a second hand for the price of brand new vehicle...applied personal loan instead of vehicle finance the bank deposited R145000 into their acc instead of R129000 now they refusing to give me my money the boss MR Lizzel offerd to pay the 1st four month installment untill I can be able to lower my installment I've been waiting for him he is not even replying to my message .please I need your help hellopeter