Mi Service Center Banashankari Bangalore Karnataka No 225 Y Floor Smart Care Electro Services Pvt - Service Center damaging phone and charging money

My phone stopped working, I submitted the phone to MI Service Center, Banshankari *rd Stage in Bangalore for inspection, they initially reported it to be a fingerprint button issue which they said would replace at cost of ****.** rupees, after replacement it started working for a day and stopped again, I submitted phone again, then they said it's a software issue and flashed my phone, now they are saying motherboard is damaged and needs to be replaced asking ***** rupees again for repair cost, charging more and more money while damaging the product.