How to go the legal route with suing a mechanic shop?

I had bought the car in the first week of may 2023 and if ran for a good two days before I started having problems with it and I had to get multiple things fixed and it cost me over $500 to fix the first time, so I could drive it and then it was back up and driving great until something else happened out of nowhere I had to pay to get that issues fixed and paid close to over $350 dollars in less than a month, and then my coilovers had went out and I had to spend over $1500 to get the parts and $300-$600 for labor. And I was driving good for another good week or two and then my crankshaft position sensor had caught fire and melted and that was the last time I had back in November of 2023 and the guy I took it to said he was going to fix it and I bought the parts for him to put on there and he never responded to my calls or text and every time I went to the shop he wasn’t there and then I had went again on one of my days off and asked about my car