This is because every time you disconnect a VPN and connect it again they connect you to the new IP. The solution is to get a Dedicated IP, whenever you want to play the game login with that static IP, this way they can't caught you. Be careful before buying a dedicated IP, must get it from reputable provider because many of the VPN providers give you blacklisted IP which is useless for you. I would recommend you to get it from PureVPN, reliable and affordable, best for gaming and streaming.