Samsung India — deny to repair my mobile in warranty period

Address:

Cuttack, Odisha, 754025

I purchased a samsung mobile (Rs.70k) on 25 aug 18. After 10 month a software update given by samsung. After update various type of problem came out in my device. Main issue is suddenly heating issue. I visit samsung care but no resolution found. Finally i submitted my mobile in warranty period 23 aug 2019. The samsung customer care of head office said have to change the motherboard because of motherboard problem and demand money for repairing because out of warranty.. I try to prove that mobile is not out of warranty it's under warranty.. Then i prove it... They are deny to repair.. And my mobile is there since 23aug 2019 till date... When i contacted customer support they told me your mobile is ok... Take your mobile from service center.. Without repair... Now they don't receiving my phone.. Pls help