I had to go through the account suspension process too. They send you an email and then you have to write a response. They didn't send me an email when it was reinstated but expect that within 24-48 hours. It's a bitch because Twitter gets thousands of accounts created every day by bots over Tor. Blame the spammers, not Twitter. At least they let you create an account at all. The easy solution for them would be blocking account creation from exit node IPs.