my idirect modem cannot be acessed

i m using idirect modem equipment in afghanistan from 1 year. one day my internet go down suddenly. so i try to acess through telnet, but it cannot be acessed. so i found that my ip has changed automatically & also password. so now i can;t enter into my modem. so what will be the possible solution. pls inform me anyone know abut this type of problem. i will be v thankful.