Yeah, I agree that you should approach your bank. I am surprised
over the internet, debit transactions are carried out? Usually, it
will be a credit card wouldn't it?
Anyways, your best bet is to check with your bank. Hopefully, they
accept that it is a fraud and the charges can be reversed for you.
I only know of credit cards. There's usually a fraud protection
scheme. And if there is any hint of a credit card being
compromised? The payment/transaction will not go through and the
owner notified which usually result in the credit card being
terminated and a new card issued.
Good luck with your neogtiation and remember to stand your ground.
Go read the fine prints and know your rights too.