Modi Hyundai — Clutch Pump Failure

I owned a i20 Sportz 2012 model (petrol). Recently there was an issue with the clutch. While in traffic, or to be more precise, within 5-10 minutes in traffic, the clutch would start to get sticky and within another couple of minutes, the clutch pedal will become very hard to press. After this, the car will not move forward and eventually the engine will not start.

I took the vehicle to Modi Hyundai service centre at Chunabhatti for repair on 14/02022. They changed both the master and slave cylinders and assured me 6 months warranty if the problem with clutch persists. After 1 month of service, the issue with the clutch started again. Eventually I called up same service centre and booked appointment on 10/08/2022. They checked the vehicle and told me nothing is wrong. I was also informed that issue with clutch happens with some of the i20 petrol variant. The mechanical engineer went on to advised me not to use the clutch too much while in traffic!!!?? Is this the SOLUTIONS??!!

Also, is this the service offered when customer is claiming the warranty offered by the service center?? If I gave the car for paid servicing, they would most probably recommended to change the whole clutch system again.

Please provide a solution on how to fix this recurring clutch pump failure issue and the warranty too, if indeed I am entitled to claim as offered by the service center.