Why have i got a Error on blackops?!?

im gettin a error on black ops saying "the call of duty; black ops servers is not available at this time. please try again later or visit http://www.callofduty.com/blackops/status for updates." i have not hacked or glitched in any way. the last time i played was in the beggining of march and i just switched on now and for three days straight it has gave me this message. im internet is fine as i can access multiplayer on other games. please help me out thanks.