Xiaomi India — misleading

Address:

Dumka, Jharkhand, 814101

Charging port of my phone was not working. So when the battery was dead it gets switched off.
So i take it to the service center.
According to the service center motherboard was crashed and it should be replaced which costs around rs.4000. But after further inspection of mobile in local mobile phones market there was no problem in motherboard.
So i decided to change charging port of my phone and now it works.
The attendent of service center are of no use. They give wrong information about phones.
In local market i spend only rs.250 and my phone is working again. So why to spend rs.4000 for no use.
Even they can't tell the simple problem of phones why they are sitting there to help others