Terrible experience, I bought a car that worked for three days and stopped working, yet We Buy Cars can't assist me.

Terrible experience with WeBuy Cars, I bought a 2012 Chevrolet Cruze cash on 20 September 2021 and on 24 September 2021 it started to give me problems, the car stops the engine while you are driving at whatever speed or gear and I called them seeking assistance and I was advised to lodged a complaint online which I did hoping I will be assisted and after few days of calling and following up they declined my request with stupid reasons of saying I singed a sales agreement that I test drove the vehicle and I am buying the car as it is, while when I test drove car it didn't have any problems, the car didn't have any problem or showing any sign of problem when I test drive it. Now the car is parked I don't have even a cent to call someone to look at the car, I feel very disappointed and defeated with the treatment from We Buy Cars I wouldn't recommend anyone to buy from them. I bought a car that worked for three days and they say that they cannot assist me, it is completely unacceptable and **********.