Fraudulent car sales

Hi, 3 months back, I bought a second hand car, in Bloemfontein, the dealership is L&F AUTO "your motor company" the car is Audi A4 2015 2.0 tdi 130kw Q S/Tro, the dealership promised to service the car before I took it, which was for 120000km,that includes the changing of the timming belt, break pads n other accessories, which he put a stamp on the service record, that the car was serviced by PRO MOTORS, 188 OLIVER TAMBO ROAD, BLOEMFONTEIN, 9301,TEL:051 447 1419, on the 30th October 2020, I took the car to Audi Center Bloemfontein, and they picked up that the last service was on the 105 000km,the 120 000km service was not done, which includes the changing of the timming belt and other accessories, which now adds up to R14000, 00,please assist