Well here is a similar experience:
My house has 3 computers; my dad's, my sister's, and mine. My sister got our IP adress banned so none of us could get on VMK. I knew it was my sister's account that got banned because I asked my mother in Virginia to collect my credits and it worked. I could not have lived without VMK! My father had decided to switch from Comcast to Verizon; and we got a new IP adress. Yay! I could get back on VMK. Now I don't want you to waste money doing this (by the way Verizon is faster than Comcast)

, but it worked for me, and I don't know if it'll work for you because I was not the truly banned person.