Apple India — Iphone 6 extremely slow after software update to 10.2

Address: Udaipur, Rajasthan, 302581

Dear customer care,

I bought iphone 6 in march 2016. Details are as below :
Model : mg472hn/a
Serial no. C8qpvpn1g5mn

On 5th november 2016, software of my phone got updated to is10.2. Surprisingly, the phone became very slow after the software update. I took my phone to the apple's authorised service centre at udaipur (Rajasthan, india) and they did not find any problem in the device and said that it is because of slow network of the service provider.

Incidentally, my another phone has the same service provider and it is working very nicely. Feeling aghast with the performance of my phone, i again took to the apple's authorised service station at udaipur. This time they again did the software updation but to no avail.

I am feeling very frustrated and want your kind intervention in this matter. Please help me. My phone number is [protected].