obviously they detected unusual activity in your account and suspended it.
i'm sure this has a timer , like money hold, and after that it will be reenabled.

i suppose they do this to give you time to "clean" your computer and reset all of your passwords to secure ones,
after that you should then ask them to re-enable your account.

however, as they don't know who is the legit owner, they will most likely not raise the block/money hold until the timer runs out, if you are in a hurry you should add your ID on the ticket.