Lenovo — regarding the service of lenovo ideapad 100s

My brother bought me lenovo idea pad 100s from the us but it underwent a problem and i visited the service centre and they told me that invoice, passport, visa are required but i mailed this issue to [protected]@lenovo.com, he sent a mail that no need of them just invoice is sufficient.
I called my brother and requested for invoice and my brother has forwarded the mail of bill which received from the online shopping site
The same bill i have forwarded to the service centre and given the laptop, but after a week they called me said me that bill is fake we need an original hard copy of the bill.
But the hard copy is not there, the online shopping merchant mailed me the soft copy
Invoice link: http://view.emailinfo2.bestbuy.com/?qs=521bdb7514430c564c3af7313d6619619af289d93...⇄

Please help me out of this

Laptop model:100s-11iby (Ideapad)
Serial number of the laptop is: yd01axaf

Service centre details
Hitech informatics pvt ltd vijayawada g. F-1, first floor, anjana apartments, stadium east road, labbipet, 520010, vijayawada, andhra pradesh