Business ProfileforAuto Union

On march 17, 2022 I bought a 2006 ************** at auto Union for $5,500 so the car was worth in value ************ as 2300 when I found out but the main issue is the car went to limp mode not even 3 months and so I called him he refer me to ***************** and I paid for the service but yet still they kept the car for almost 2 months and when I got it not even a day it went back to limp mode so I took it back and he look at it for days and days and months then he said the transmission so I said go ahead do what you need to do so a month pass he called he said come get the car it's done so I got there and the car not working and then he said oh I need 1200 to buy the transmission I never heard of an auto shop will charge you first when they already ***** up at first second they got my car so it's always after you pay when the service is done but the fact that I'm so pissed is my car was sitting there for months he just now telling me. Come on it's not a joke. To not have a car in ********** that's my only money and transportation ************************************* it's like he took a life out of me because that's my access to my money luckily I'm humbled enough and rode the bus but finding out like that it's so wrong who calls you and tell you to get the car but it a not working have you wait for months and then he ask oh I got to order the transmission he wants the money I don't think that sounds right.. I'm top of that they don't answer my call is because they see my number because when I use different number they answered especially the auto trading he never communicate with me only once he found out the car went limp mode and told me to go to ******************.. now for less than 6 months I only rode that car for about two good months I deserve to exchange or somehow a refund because money is not a toy and I don't just pick it up in the road 5000 dollars in less than six months it's a lot and it's not to be played it's really a bad business. Pls help me