Misdiagnosis has cost us thousands

Another week has gone by and I’m still without my car. This morning I received a call from the owner Rami advising that I need to pay another 2.9k. This is after the meeting he summoned me and my husband to last week after we wrote a report about their shrewd business. He promised us that they will take care of everything and that wel don’t have to pay another cent. In the mean time they’ve given us an unroadworthy courtesy car. Faulty locking, malfunctioning lights. This is absolutely the worst service ever. I dont understand how one runs a business in such a manner. We have already lost over R25000 replacing one part after the other due to their misdiagnosis. Not yo mention hundreds of rands on Uber rides. If this was handled by an expert we could have saved on unnecessary expenses. There is also an element of arrogance from them. Today we were told can do whatever they dont car. How's that for customer service??? This will be escalated to consumer protection without a doubt