This exact same thing had happened to me once I was given staff priveledges on iZone on my mobile account. I couldn't go on any other server as it gave me the same error and wouldn't send me an email. I asked Gunderak yo fix the issue on at least iZone and he said okay and he transferred the account to one of my other emails for me. After playing for a few days I was banned for hacking saying I had unreleased items such as a Pulse Rifle and later the account was completely deleted. Now I lost all the money I spent on that account and have been pursuing getting my money back I spent.