no wonder there is a warning when i opened my account. these hackers are one of the reasons why people lose their confidence with crypto... something ought to be done about this. really sad. 
The only thing that you can do to protect yourself is to keep your eyes open to anything that seems suspicious because if you fall for a trick like this there is no way to recover your bitcoin, while bitcoin give to us the power of being banks this also means that you have the responsibility of securing your coins as if you were your own bank, so if possible store most of the coins that you have in cold storage so this doesn't happen to you.