Unfair Decline of Repair Warranty

I took my Renault Megan RS for a clutch and flywheel replacement in June 2018. The cost of the repair was R31948.15. The warranty for the particular job was 6 months and was given by technical manager by the name Tyler Cook. In early November 2018 I experienced a similar problem with the clutch. I took the car back to the dealership and I was informed by the Service Manager (Jerome Beyers) that the warranty still applies. But after two weeks I was called by Mr. Anwar informing me that the warranty is declined for reasons unknown to me. The car has travelled for less than 4000km since it was repaired. I feel that I'm being unfairly treated and inconvenienced by this process as the car is still with them. I hope this matter can be resolved amicably.