I was sceptical of this at first but it actually works.
1) Download CyberGhost6 (a hidden IP internet surfing program)
2) Connect your Wifi to the Program (It should do this automatically when you load up)
3) Once you have connected to the program and you're internet is said to be protected, go ahead and log into league.
4) Once you have logged into league, go onto the program and click the stop protecting button (it should be the big green one in the centre)
5) Wait for your IP to reconnect, and you should be back onto the chat in League !
Feel free to uninstall the program once finished !
Hope this helped guys !