Xiaomi India — new phone with warranty is previously damaged. need assistance asap.

Address:

712258

My mom's phone... Redmi note 5 pro.. I bought it off amazon. We have the warranty card and everything. The display went off a few days ago. We went to the redmi service centre and they are saying that the phone can't be replaced or renewed by the warranty card as the motherboard has been previously tampered. What the hell is this? It will cost 8k for the treatment... What's wrong with redmi. I use a redmi phone as well... But i am disgusted by this company. They spit on my trust. I need immediate assistance and response from the redmi team.