Appalling service from Planet42 and Bryanston Executive cars

I bought a vehicle from Bryanston executive witch was financed thru Planet42. On the way home the vehicle started leaking oil and we contacted the dealership immediately. They said to take it to a mechanic to get it fixed. after about a day or two the vehicles gearbox seized, and we had to have the vehicle towed. we towed the vehicle to the mechanic and had to obtain quotations witch we did. we battled to get hold of any one at Plantet42 and whenever we called the dealership no one was available and did not phone us back. The dealership eventually informed us that the quotation we obtained was to expensive and they will have their own people fix it with second hand parts. i was not happy with this and informed them however the dealership insisted that they do it their way. i wanted to cancel the deal and have the dealership pay back the money to Planet42 but planet42 said the dealership should be allowed to fix the vehicle. i have been without a vehicle for almost 3 months and also stopped the payments as i am not paying for something i do not have. i was then told the vehicle is ready on the 13th October 2022 and i can fetch it from the dealership. when i contacted the dealership to arrange to pick up they informed me the vehicle is still at the repairer and i can fetch it there. I picked up the vehicle and was appalled at the condition, it was dirty, had no oil in the engine, had a dent at the back. when we drove, we could feel that the gearbox is still not 100% and there is a lot of smoke that comes out of the exhaust. When we contacted the repairer, he said he only fixed what they told him when the dealership was contacted Luciano simply said that we bought a 2 nd hand car and if we want a new car, we should buy one. I find this service very appalling and when i informed Planet 42 of all of this and that i want this deal cancelled and the vehicle returned to Bryanston Executive, they said i have to pay 7 months cancellation fee. Why should i pay for the poor quality of vehicle the Bryanston sold me. they were given the opportunity to fix it and failed. i will now be contacting the Ombudsman and also seek legal representation.