BIDVEST ANNLIN - Wonderboom Bad service and Incompetence

Have been taking my car to the service for the past few years. Earlier this year had a breakdown with My car which was a VW Tiguan R_Liner. Bare in mind have never missed a service and have been replacing everything needed to be replaced with each and every service. To my surprise, I was told that the CamBelt had been damaged and the reason is that it should have been replaced. Now any reasonable person who takes his car to service, is expecting that when he drives out everything mechanically should be 100%.

Now the warranty was covered by the MECHANICAL WARRANTY was/is COVERED BY BIDVEST and the still refuse to pay for these damages. This is incompetence on the highest status, especially with the fact that I have never missed a payment nor service due. Still don't understand the grounds that they basing the non payment.