Refund on car part

On the 5th August I bought my Ford Figo 2016 from We Buy Cars in Durban. Mark was the salesman. The Dekar report showed only a problem with the handbreak. The car went for a service on the day of collection. On the 19th of Aug I sent a recorded video to Mark asking about the noise in the engine, which on he rep**** "it doesn't sound bad. At that stage I had done about 400km including the trip back from Durban to Richards Bay. The sound just got worse. I asked Mark if I sound take the car to Ford, which he never rep****. On the 27th of October I took the car to Ford and they informed me that the fanbelt needed to be replaced. It had to be done so I paid for it. I then contacted the complaint department and Wynand Pieters rep**** saying it's part of wear and tear parts. I feel that I paid for the service that was done before I collected the car and the fanbelt should have been checked whilst servicing the car. The invoice amount is R1390.20. We Buy Cars sent me an email to say they not going to refund me.