Xiaomi India — mi max prime

Address:

Alwar, Rajasthan, 301001

Sir
I bought mi max prime before 8 month ago and in between one time mother board damage according to service center it was damage by liquid then i replaced it by 12k now it power switch not work and again went to alwar rajasthan service center again they told that it is damage but there was no scratch marks in phone now they close it and when i check my phone there was one issue came that volume switch also not work and they deny to repair it...

Pl do needful