Dekra and WeBuyCars not reliable

Recently bought a car from WeBuyCars based on the results of the Dekra report. The condition report rated the car as very good in most instances and gave it a gold sticker. As soon as we drove the car out on our way home, the problems started. The transmission which was marked as very good started giving warning signs and the vehicle seems to be losing power. Suspension has some serious defects. Since buying the car on 2nd of April we have already spent money on (i) having to replace engine mountings (ii) replacing control arms and control arm bushes (iii) replacing the water pump (iv) replacing the thermostat (v) replacing the left inner CV Boot (vi) trying to replace the clutch kit. All of these with no current end in site. Currently would not recommend that anyone places reliance on the Dekra reports when buying cars and suspect the faults on the car and dashboard were cleared purely for test drive, as they came on less than an hour of us driving home and come on every day since.