hmmz...
I didnt hear this rumors before, neither can i confirm if its true or false.
If they ban you for multiclient and they really check on IP,
say that a family member was also playing on a different computer.
same IP means the line from your ISP to your house.
then a router will split it through lan IP's but those cant be seen from the outside (legally not)
so basically they cant see if the 4 clients you run come from 1 pc or from multiple
they say they can (some rules, 'from the same physical computer, so not same house or IP adress')
but i think they cant.
so just try blaming your brother (if you dont have one, they dont know... so just say you have one) who was playing from another pc