Data alloacation

I am very unhappy with the Hp computer deal i took out. I dont understand how anybody can possibly use up 5 gigs of data in less than 3 days. I was under the impression i should get 5 gigs of day data and 5 gigs of night surfer. Last night after midnight i tried to go on the internet to no avail. Seens dAta ******* is the name of the game with cellphone companies