We buy cars is Nonsense

I bought a car at we buy cars in April, when I bought the car the Dekra said the problem of the vehicle was only the suspension but when the engine light popped the guy that was helping diagnosed the car and said it's nothing The light disappeared took it, it came back I kept on complaining but he ignored us and tried complaining head off escalated, until the 30days was over. No one helped me. I decide to sell it back I got it back with close to nothing 😭😔