Nokia India — service center are looting to customer

Address:

Gautam Buddh Nagar, Uttar Pradesh, 110025

Dear all;
Please let me know contact numbers and email of the Nokia India Upper level customer officials and grievance cell.
First I want to know the exact definition/meaning of "Liquid Problem" in Nokia 5.1 Plus. There was some problem in my Nokia phone display; some lines were appearing on it and nothing. So, I took it to the Neil Communication, an authorized service center located in sector 10, Noida. When I was waiting for my turn there, I seen that many people were having hot argument with the manager or something of that service center, because they were not happy with the solutions service center provided to them. Customers were arguing because service center was charging them some amount for some fake issues.
On my turn I went to the customer care executive, she was a girl, and I told her the whole issue and about the warranty. After knowing that this mobile phone is in warranty, she was just discussing about some liquid problem, I was amazed why this girl is just stressing on liquid problem. I already told her that my phone never came in touch of water and I never walked in rain by holding my phone in hands or keeping in my pocket. Then how is it possible to get liquid in it.
I was damn sure that there wouldn’t be any liquid problem in my mobile phone. So, I just submitted it to service center and left for my home. After an hour I received the message that I have to pay 10812+GSt as the repairing cost of my mobile phone. I was really shocked after reading this, I just call back then to service center, and asked him about repairing cost, the guy told me that the problem is related to "Liquid Problem" and for repairing it will be charged. My phone is under warranty at the current moment.
At the last time (one week before), I have heard from many nokia users for the same Nokia Care service center that they are also facing the problem of "Liquidity" and they were also charged for repairing.
I want to know why Nokia Care are appointing unskilled/semi-skilled Service Engineer at the Care center, the Care center should be highly consumer/customer oriented, not for charging amount(the earning center)
Also I want to know where I have to lodge the complaint so that the necessary action should be imposed by the Nokia Upper level officials in this regards. Because Nokia Care Center is sucking the blood of the customer in the form of money.