The website freelancer.com is designed to make money off of the freelancer mostly with occasional legit projects in between.
I think freelancer.com is creating ficticious projects easy enough for people to work on then credits your account and charge you a fee. They then claim the merchant was bad and take away your "fake" earnings while still charging you a fee.
If you just take a step back and look at the postings you can see that most are basic vague postings.( I grant there are legit projects) but most are really designed for you to "win" and charge you a fee.
They probably also play this game of taking your hard earned money be claiming bad vendor etc...
Either way its basically a scam site. Unfortunately, it has yet to be fully exposed.
In the meantime, you have linked your bank or credit card.
Answer this two questions:
1. Would you ever give someone from a spam email your account information?
2. if it looks to good to be true it probably is.
Still away from this site (fyi) username is fake below
Hi, Gary. Thank you for taking the time to give a feedback. This is really appreciated as it drives us more to improve our services. We would like to assure you, however, that we are in no way affiliated to any freelancer or employer, nor do we post "ficticious" projects just for the sake of charging our members. We do post contests for our valued users to participate on which are always posted on our official Facebook page. Should you have further concerns, please do not hesitate to let us know and we will be more than happy to assist you. Take care!