Samsung — Poor & Defective Mother Board of M31

Website: r2.community.samsung.com/t5/Community/ct-p/in-community

I bought Samsung M31 (6GB RAM and 128GB ROM) mobile in June-2020 from amazon.in for Rs 16, 999.00 after discount.
Yesterday, 22nd Sept'2021, the phone started to reboot automatically and started to hang all of a sudden.

After visiting authorized Samsung Service Center, the technician said that it has got motherboard issues and the same needs to be replaced immediately or else the phone will get dead any time. Upon asking the reason for this, the technician said that due to prolonged and excess use the motherboard got damaged.
The cost of motherboard is Rs 8500.00+ with only 90 days warranty.

My question is a phone having 6GB RAM and 128GB ROM having 6000 mah battery cannot even handle the load o[censored]sing Whatsapp and Facebook that too for few hours a day?

Is it justified to ask Rs 8500.00+ for motherboard that cannot even last for 2 years?

Instead I would rather buy a new phone of this amount with a year warranty.

@ samsung spoiling its reputation with cheap hardware