Hi xyz
first of all have you called your credit card company? They all have fraud departments to handle these things..they will send you forms to file dispute and should temporarily credit you until they investigate the charges..
are you sure that was only thing stolen? You should probably monitor your credit reports ..you can place fraud alerts with credit reporting agencies as well..if you foresee problems there..
also the ftc has a nice package of information you can request with tips on identity theft and fraud that you can request on their sight.
I am sure there are many experts here who can offer much more concise advice..just responding with things I have personally done regarding i.d. theft in past
once again....
I am sure someone will be along soon to really help you out!