anyone knows airties?

[the dark ninja]

i have airties internet modem at home
a while ago, my internet started to redirect me to my provider and said that i use wrong pass or username...
when we checked it out with the provider, we found out that a tourism company is using our internet...

i am using airties internet modem
even if we found out how to fix it, internet throws me out once a while and i have to fix it back on my modem's settings...

so what they did is that they found out my username and password, they copyed my modem and using them on their computer...

is there a way to fix something like that?

note= also, my lan lights of the modem keeps blinking when i turn off the pc, does anyone know how i can fix it?