Xiaomi India — mi note 3 (mobile)

Dear,
I am a student, studying at bangalore
I have sent my device for repairing to mi service center by availing the pick mi services (Within warranty),

Its been a 10 days plus, and now they are saying that device has physical damaged which is not fact.

And they are denying from the warranty services saying my device is damaged. However it was not damaged when i gave to pick up guy, pick up guy has physically checked the device, and then he took.

They tell us that device will get repaired within 7 days.
Its very tough to do follow up more than 15 days and finally getting nothing for a student as i cant call them everyday and emailing everyday.

Kindly do the needful,

Regards,
Sumit
Bangalore