Xiaomi India — mobile phone is not from india

Address:

Lucknow, Uttar Pradesh, 226010

Hi i had purchased a mobile red mi note 4 (4 gb/64gb) in year 2017 via e-bay.com, where mobile is properly working when i had visited the xiomi service centre at lucknow nishantganj, they told me the mobile set is from china and they cant chek them even and they can not take it for any of services related issues.
I am having the original bill also but they doesn't entertain me as well and said me that i have to contact xiomi for this issue.
Kindly help as i had purchased the mobile in jun'17 and the set is very new and i want to update s/w of my mobile.
I need urgent solution for that mobile as i have no any other set for my regular use.