Bad Service and arrogant owner

In July we towed my bakkie to Pendulum motors in Rustenburg and they promised to check the car and within a week or 2 it will be fine. On the first of September we paid R15000 as they said they need deposit before continuing with the car and till today the car is not yet not fix. The owner is arrogant and said on Monday we must come get the car it’s not fix and he can only refund R2000. In the past 4 months these guys has been taking us from pillar to post . We check with his employees who said these guys is arrogant and hasn’t done anything to the car in the past months. When we call the reception told to hold and later on hang up our calls until we went to that workshop. The service there is not ok and how can they not refund our money of R15000