[Resolved]  Nokia India — about misbehaviour of authorized service center and damaged my nokia 5.1 plus mobile phone.

I was buy nokia 5.1 plus in oct 2018 and after 2 months of buying, the vibrator was not working. so i went to Nokia authorized service center in Auranagabad, Maharashtra. They repair my mob in warranty period and gave me after 1 months. but when i pickup my phone and insert both sim cards into it, they cant showing any network. but when i went next time into service center they saying like that your phone get damaged due to soldering work is happened on motherboard and hence you cant get any network. so you should pay for this.
then my complaint is what is my problem. i show my mob only in authorized service center not in any other stores. still my mob is in warranty period then why i have to pay for this..?? and they said to me that your mob is out of warranty due to some work doing on motherboard.. what can happened like this type of irresponsible work in your reputed Nokia company. please solve this issue as early as possible.