WeBuyCars service

Purchased a car with cash on 04/03/2022 dekra report according to webuycars disclosed that the vehicle has minor gearbox issues but this is far from the truth. I test drove the car to find that the gears seemed fine and popping into place with the short distance and public roads I was driving, but after purchasing the car and getting on the high way I noticed that the 5th gear pops into place but does not drive. I have then since had an endless headache trying to get it resolved only to find in the end that they will not help to get it repaired and instead I need to exchange the car for something else of the same value. I get no straight answers from the complaints department even after mentioning this issue within 30minutes of driving the car off their floor. The service and assistance is horrible and even trying to get management involved is impossible. I feel hopeless in knowing where my car is and if this battle will ever go anywhere and all I have done is waste time and money for something they seem to have no care about.