Poor quality workmanship and components removed from vehecle

Being away for the long weekend I phoned Automechanica whose number I found in my postbox and asked them if they could collect my car from home and replace the seals on the gearbox, replace the oil and oil filter as well as check /test the spare diesel injectors ( 6 of them ). The person I spoke to, the Son-in law, which said they could do for me and gave me a quote as well with the assurance that they would collect the car on Thursday the 10th of August. The 10th came and went and nobody came to collect the car at my home. That afternoon I phoned again and spoke to Danie, the Father-in law, and he promised to collect it on Friday the 11th. I also asked him again about the six injectors and he said they would check them. I phoned my daughter who was looking after my house while I was away and told her she must put the six injectors in the boot and tell him about it when he came to collected the car. On Friday he came to collect the car and my daughter told him AND SHOWED HIM THE INJECTORS IN A PLASTIC BAG IN THE BOOT THAT HE MUST CHECK. Sunday morning we were back and my car was there as well but did not check anything assuming it would be right. Sunday evening I took the car to the garage to fill it up and got a clunking noise from the front and bottom of the car. After further inspection I found some of the bolts loose on the suspension as well as no injectors. Driving to work the next day I found that the seals were leaking on the gearbox. I phoned Danie and told him about this. He said he would fix the seals but had NO knowledge of the injectors. Two of those injectors I bought the previous weekend for R 5000.00 rand at ASAP and wanted to have them checked with 4 others that I bought previously. I took the car back on the Friday for him to fix the oil leak on the gearbox and also told him I am going to report a theft at the police station. He wasn't very happy but said he would look at the seals on the side- shafts. Upon receiving the car on Saturday afternoon he said if there is a leak it would be on the front of the gearbox and not where he replaced the seals which is acceptable . On my way driving home, there was a lot of rattles on the car and I decided to fix those myself because I CANT accept that kind of quality and it wouldn't help to take it back. So to conclude, after wasting time and money, I had to fix my car myself and loosing 6 injectors worth R15000 it is safe to say that I am very unhappy with all that has happened and the service, no value for money, I am *****ed.