BS, report it as fraudulent transactions (which it is) they will sort it out quickly
I would be skeptical on that. I work in the fraud department of a major bank, looks more a like a computer or human error of some kind. If someone contacted us with a case like this we would advise them to contact the retailer to begin with.
Fraud is obtaining funds by deception. If they were trying to do that I doubt they would put the exact same transaction through a few times in their own shop. If they were really trying to comit fraud on your card they would've copied the details and used it elsewhere.
It doesn't matter how you paid them (or rather how they stole it), credit card, debit card, wire transfer, etc, the bank must always reverse the charge in fraudulent cases.
Definately not the case. If there appears to have been negligence on the part of the cardholder (ie. you left your card and a note of your pin number lying around) then a refund would be unlikely. Most people who get fraud commited against them do not fall into this catagory though, and certainly not the OP.