I think it also checks a file in your PC , so you would need to reformat your PC. After you can use a VPN ( google it to find one ) and you can play again , I haven't tested this ... But should work! Give it a try! should work :P
( Do not start it without the VPN ) If you do it will automatically put the ban file in your PC again , and you have to do it all over again , always start with VPN on. )
You can try this , It SHOULD work , but i don't know. :P
[If this does work , it can't be patched unless they BAN some LEGIT players...The IP Ranges.