[Resolved]  Samsung India — poor customer service, issue with galaxy s7 edge not resolved

I have a samsung galaxy s7 edge, model sm-g935fzsuins, and serial number rz8h90dt0ge.
Background of the problem: the phone was purchased in october 2016. After being used for 6 months, it developed a screen flickering problem. It was repaired for free as no external damage was seen and the phone was in warranty. This was in march 2017. Six months later, the phone has developed the exact same problem again. However this time the phone is out of warranty. The local customer service center requested me to talk to the samsung customer service supervisor so that they can grant an exception in such a case as the same problem is being repeated.
After repeatedly calling 180040samsung, i was finally put in touch with a supervisor (Named swaroopa). She was of no help and all she did was read out the samsung policy. If i wanted to know the policy, i could have just searched it on google. I didn't need to take so much efforts to talk to a supervisor. She did not even take the effort (I had asked her so i know) to talk the local service center to know the exact nature of the problem.
I requested another supervisor call yesterday, and i still haven't received it.

My major concern is, why should i have to pay for the same problem recurring again and again. Why wasn't it fixed the last time. And if i do pay, what is the guarantee that the problem will not occur again 6 months later?