Hp commerrecial business laptop
Extended warranty

I bought my Laptop (nx7400) from my college before one & half year ago.that time the college said that we got Two years warrenty extra from HP.But my Laptop Warrenty is not extended. I have Invoice in that the Three Warrenty is written. My other college met have two years extended warrenty but not me.

So Plz suggest me something & What kind of Action I should take against my College

my Cell No-9970343074