Car major defects not mentioned and refusal to give feedback on my case

I bought a car from WeBuyCars. According to the DEKRA report, the only major issue listed was an oil leak. I had it fixed, even though it cost me a hefty amount. It was a defect I was aware of, and I knew it would cost me.

One day while driving, it started to rain. When I tried to use the wipers, they didn’t work. I nearly got into a car accident — luckily, the other driver stopped just in time.

I called WeBuyCars, and they told me to take the car to an RMI-accredited workshop, which I did. The workshop found several major defects that DEKRA did not mention. To make things worse, after picking up the car from the RMI workshop, it broke down.

When I called to ask what they did to the car, they said they are not responsible for anything that goes wrong with the vehicle.

My case number is 88819. I bought the car on the 21st of March, and to this day, I’m being sent from pillar to post. Please — I need help. If anyone out there can assist, I’d really appreciate it.