Nokia India — mobile parts repairing extra charge by nokia care service center

Address:

Shreejee Enterprises C-64, 1st Floor, Raj Nagar Distt Centre (RDC) Ghaziabad-201001, Ghaziabad, Uttar Pradesh, 201001

My friend's (Suraj) mobile is on the warranty. But they charged me rs 1415 for changing the sub-board. They told me that your mobile has water damage and it doesn't cover the mobile warranty so you have to pay so we need to change the sub-board. I bought this mobile last december. They claim my warranty on the nokia head office but they charged me rs 1415 and provide me a handwritten bill. They cheated me because i confirm the sub-board price to another nokia service center and they provide me 900 rs quotation for sub-board.
Then i complain to the service center for two different prices for the same mobile model sub-board. So they told me that if you are not satisfied with the price, we remove our new parts and chang with your old sub-board. I believe in nokia but they do not treat me well, the executive who worked there, using bad words on me.
I requested to you kindly resolve my problem.

Service center name-
Shreejee enterprises
C-64, 1st floor, raj nagar distt centre (Rdc)
Ghaziabad-201001