VEHICLE DAMAGED AND NO APOLOGY LETTER RECEIVED

Hi, I complained about my vehicle been damaged during 2nd service of my car. It had grease on the bumper, grease on the 2 seat belts, grease on the sun visor and a dent to the driver side sill - *** from customer services and also my vehicle warranty dates are incorrect. The service mananger Clinton lacey from kingsmead Durban came out to inspect the car and accepted responsibility of the damage and it was agreed by him and myself that I trade the damaged car in for another exact vehicle for the same price. Also I requested a letter of apology, all I received is a email saying im sorry for the seat belts, noting stating the date my car went for service and no vehicle details, I have spent a lot of time begging as asking for a proper apology and each time I fone, the dealership gives me a different story about what happened. please sort this problem out asap as I am feed up with they service and noting up to now has been sorted onmy damaged car.