German Auto Repair Charleston SC Feel like I got ripped off at this place North Charleston South Carolina

I went to German Auto Repair in Noth Charleston after finding them in the yellow pages. I was quoted a price after they looked at the car which was high, over three thousand and but I asked them to complete the work. I was then told I need to put a deposit down of $1,000!!!! I have never paid a deposit before but wanted the work completed so I paid it. THen after the work was completed I went to pick up the car and paid the remainder, and as I was leaving the mechanic there came to me and said that he never replaced the main snsor unit that was the main reason the car needed to go in the shop. He said he didnt think it needed replacing and wouldnt be causing the issues I was experiencing. This is after I already paid the grand total. I was late for work and thought if he solved all the issues then maybe it would be ok. But the main problems were all still there. And after contacting them they demanded I pay $400 dollars more for a used sensor to be put in. An absolute shake down. Stay away from this place.