you sure your ip isnt dynamic? if not pull out the power cable of your modem and stick in after 15 secs and c if you ve got a new ip...
other options are changing provider, or calling them to change ip for you..
i had static ip too in the old days..... i phoned my provider and first time the guy was really nice and did it immediately,
somehow i needed to change ip again, and the second time the dude wasnt that kind, dude they ll tell you that they cant/wont/its hard or whatever, just LIES!!!, all they need to do is pressing rolling their face over the keyboard and its done..
just keep brabbling to him, if he still doesnt want, ask him for his name and tell him you ll fking quit this shit provider cuz of him and c what happens