Bad buy from We Buy Cars Midstream

On 14 April I bought a Ford kuga on credit at we buy cars midstream. I signed the contract and finalised everything as the car had an A rating and according to WBC they sent the car for a major service. apon ariving back home, the turbo started giving problems as the car gave an error saying turbo overboost problems, Henco at WBC branch told me to take the car for diagnostics which I paid R250 for. they did it and several errors popped up on the car, they reset the errors but still gave overboost error. Today on 25/04/2022 we took the car to Ford Burgersfort, another diagnostic was done and they said the same thing and advised me that the car must come back next week wednesday, for further assesemnt which will cost me another R2900. and thats not even the repairs. I need we buy cars to come and fetch this car from me and get it fixed or we must cancel the whole deal(contract) as I am sure that we still have a cooling period. Please contact me on *** should you wish to respond to this.