Dell — Warranty issues

Address:

Jhunjhunu, Rajasthan

I buy a laptop in aug 18 2014 company gives 1 year waaranty and accedential warranty i am facing problem in screen but when i call dell company says your warranty is end in july but how it possible when i was buy in aug 18 2014 and i have bill when i try many times then company says that send bill when i send bill he says that your bill is not seen proper