Insufficient information on a purchase

Game carnival mall!!! I bought a laptop on the 8 of December as a gift for my girlfriend.. when i was buying the laptop the salesmen did not say anything about registering the extended warranty within 7days!!! I surprised my girlfriend witb the laptop on the 16 December.. only to find out that the warranty place is closed .. we have been trying to get a hold of them for a long time !! What kind of sales people do you guys have that cannot give proper info!!! Now who is going to cover the extended warranty ??? It clearly is not my problem .. I will expose and share this all over social media!!! This is *****.. Plus the warranty place is not even open and its already the 4th of January 2018 !!!! Someone needs to take responsibility for this!!!