Online scam/ refusal of refund by bank

As I understand it, banks have a legal duty to refund unauthorised payments where there has not been negligence by the customer, ie where their own security system has fallen down. Unfortunately it seems that you authorised these payments so I do not think the bank is legally obliged to bear the loss, it will depend on their own policy. You have done the correct thing and reported it, so hopefully the anti fraud investigations by the gendarmes and your bank will track the fraudsters down and recover your money. But it may take some time.

Never pay large sums of money to a site that promises to provide you with work, at best it's disreputable practice and you won't get value for money and at worst it's a total scam and you will get nothing.