Wrongly diagnosed and damaged

Good morning… On the 25th October I had a problem with timing belt of my car. I took it to Auto Clinique Bloemfontein . They wrongly diagnosed my car and they stripped the engine, after they broke the other parts like glow plugs… when the quotation comes they over charge me 75k. Then I asked them to assemble the engine then they charged me again 4k for stripping. They called me said the car is ready when I got there they parked the engine at the back of my car and when I asked where is the owner said he’s not available and they can’t put right in the car.then I took it to the other mechanic then he made me aware of the other parts were not in a good condition and the were far not to where the problem was. Please help me cause I had buy it and it was costing 4.5k the glow plug from VW plus the stripping of the engine where else they didn’t put it right in my car.I paid it cause they were adding the storage and they didn’t want to release it and also the timing cover is broken I couldn’t buy it cause it was also costly and I had to pay the mechanic … please help