Totally agree with Ekona, this is your only sensible action.
I would immediately phone your credit card company, they will send out some forms to start a claim through them, they are equally liable (always seems unfair on them but that's the rule) despite you only paying some of the money on card you can claim the full amount, it is then their responsibility to re coupe the money from the trader, this is a slow process but I can assure you it does works.
Remember, there are plenty of Z's out there.