If you make a new twitter account, make sure you quickly follow atleast a few people. It doesn't matter if you really cared about that person or not. Just follow someone. I had the same shit pulled on me when I first signed up. Got my 1st twitter account, stayed at "0 following", got banned for 3 days even if I did the phone thing because if your account is empty they deem you as a bot.
Now on my new account, quickly followed people as early as I could, didn't have to deal with this shit