As mentioned, Twitter locked my account for the apparent reason that it "exhibited automated behaviour". I read that this was a common problem back in February this year (see http://techcrunch.com/2015/02/10/twitter-account-locked/), but that the bug had been fixed.

I can't get the unlock code by phone because every time I request it, they never answer.

Help! Does anyone know a contact number/address at Twitter, or at least a forum, that their devs actually read and respond to? My account isn't that old, and hasn't that many followers, but I'd loathe to lose it anyway!

I also don't believe it's something I've done, since:
a) I've never used any kind of automation or bot programme (no matter what they say).
b) I haven't posted offensive or abusive messages of any sort, to anyone.
c) I haven't posted porn, or links to pornographic material, at any time. The occasional double entendre isn't a bannable offence, I hope...?

HELP!