Someone is writing on my behalf in twitter?

[Mushtaq Ahmad]

Some one is writing my behalf.........i changed my password make it strong ....i revoke all the applications also........but still 2 persons are writing on my twitter account showing their ads....how can i protect my twitter account so that no one can write on my behalf ...............

[Rhiannon]

You can delete you twitter because of a someone hacking it or if you say your titter has been hacked thy will ask security questions and ban the other users