Wrong information with R12k quotation suspect *****.

I took my car for 90k full service which was on the 20th of may. I was told that there is a sound that they need to check it before they can service. So I went back home without service. On Monday I got a call from Gladness Magubane who was assisting in the Saturday. She told me that I need to pay from my pocket for that unknown part. I asked for the quotation which I received after three weeks. The quotation was for R12k for timing chain. When I called she told me that she explained the sound was from engine which was a lie. And my service plan could not pay, so I told Gladness that I just need a 90k service and I'll fix that part later since I didn't budget for that cash. She told me that I just sign for that if any anything happens to my engine I'll be responsible. Very poor service and with wrong and falsified information. On Saturday 20June I went to Renault Woodmead for second opinion since I saw on Google that timing chain can only be replaced after 150-220km ad my car is only on 88km. Steven from Renault Woodmead checked my car and different information was given which was totally different from what Gladness gave. Timing chain is not faulty so I want to know how did Gladness came to a point that my car needs a timing chain replacement. I know that garages reverse customers money for their own greed or I had to pay that part for somebody' else car. How do we trust if our cars are properly fixed and checked to avoid accidents.