Incorrect wiring refuse to take responsibility

Fail to take accountability for incorrect wiring install and still charge just under R14k for a job I had to get someone else to complete after they said they did not know why the car would not run.

Car was there for months while they where trying to fix it and failed. Then told I'm lucky I didn't pay storage fees. They blamed my technician for the car not working, yet it only worked after my guy fixed it. I informed them that I would right a review, he tried to guilt trip me by saying I will be taking food from his kids mouth as my review will damage his business. I was told I void my warranty soon as someone else touches the car, even thought they approved me bring someone else to fix it.