Nokia India — nokia 6.1 system got off all of a sudden

Address:

Pathanamthitta, Kerala, 689594

My nokia 6.1 has got switched off all of a sudden and i have submitted my phone to geecell, kollam who claimed they are authorised personnel for nokia phone repair. They damaged my phone display which makes me ineligible for company service. Please take necessary actions to eliminate fake personnels, which will b so helpful for customers like me.
Thanking u