Bad Service - Unsafe Car

We bought a second-hand Haval H1 at the Cape Gate branch from a salesperson who no longer works there. Two months later, the car mysteriously lost power, Haval had it towed in and ran a diagnostic. They found an old issue on the computer that wasn't reset after it was apparently fixed, so they reset it, and we were on our way. The same issue cropped up twice after that...and the workshop couldn't figure out what was wrong, much less how to fix it. So we asked for the sale to be canceled and our money refunded. Instead, they offered to find us a different car. At first, we agreed, but after 3 months of back and forth and no replacement car, we asked them to cancel the sale as we originally asked. They refused. This means they expect us to drive around with an unsafe and faulty car while taking no responsibility. This is our only means of transport, so it needs to be reliable. We will not be recommending them, and won't be buying from them in the future.