Just a note after too many threads vanished.
It is obviously still possible and recommended to write a post if you have been robbed in Saigon.
Stay focused on what went wrong so other people can avoid it and make no judgment on the country or the sleeping police.
The usual recommendations:
leave passport at hotel. If hotel looks not good change place, they are the only one that can help you and they always do their best.
Leave cards in the safe, count the cash you got from ATM and go out with less than 1 million dong, enough for buying 10 big bags of trashy stuff at Ben Than market.
Use only Vinasun taxi but try not to take ANY taxi close to Ben Than market or at the arrival area of Nha Trang/Mui Ne buses in PNL/De Tham street.
Avoid night buses.