Dont get me wrong here it sucks that your not getting what you paid from right away but (personally) I think a week is a little early to contact the authorities. My last purchase was about 7 days and that was waiting on one of the Av'ers. Some times life happens.
Granted he is doing wrong by not replying to you and not shipping the item. Just seems a little quick on the draw.
Any how I hope it all works out for ya man. I know its rough to not get what you've paid for.