I bought a car and they promised that if the brakes were below 50percent, they would be replaced

I bought a car and they promised that if the brakes were below 50percent, they would be replaced. Upon receiving the vehicle, the rear discs were scored and disc pads below 50percent. They ask me to take the vehicle to get quotations done. They then refused to do the repair. I have called them on several occasions and they continuously deflect to other departments. I have spoken to their public relations person and she too has not responded to my concerns. Their sales person also placed several add on items to my finance application without notifying and I now double scratch and dent cover and Tyre and rim cover. I only discovered this at the time they wanted me to sign the contract. Which meant delaying receiving my vehicle due to another finance application being required.