Im not sure how to get you unbanned but if i were you I'd just create a new account. This month all new accounts will be given a heavy vest, shades, m24, famas, and m1911 for 7 days.
EDIT: Got 300 posts =)
reset your IP
open your cmd window
type ipconfig
this will show you your current IP address and other stuff like your subnet mask mac address
type ipconfig release
go to network settings and right click your network go to properties then right click tcp ip and click the box so you can enter an ip address
type in 10.0.0.1 and in subnet just click it will make it like 255.255.255.255
you should see your network is connected again
go back to tcpip properties and unclick the box it will give you a new ip address
go to ipconfig again and you will see your IP address is different
THIS WILL NOT UNBAN YOUR ACCOUNT IT WILL JUST ALLOW YOU TO MAKE A NEW ACCOUNT IF YOU WERE IP BANNED