Originally Posted by bigdog2

for what it's worth, i've only ever heard of scams happening at SGN, despecially SGN departures, not HAN or DNG.
I kid you not, departure passport control at SGN unironically has long lines because some of the officials are negotiating (scamming) with travellers over completely fictional procedural offenses such as: not bringing the print out of your evisa, thus not being able to validate your length of stay in the country or something (never mind the fact that your passport gets stamped upon entry) or some other made-up reasons targeting vietnamese diaspora visiting the country who don't know any better to scare them and make them pay up.
most cases, if you look like the type of person to not put up a fight when being treated unfairly, unscrupulous locals may try to take advantage of you in some manner.

oh and by the way, VISA ON ARRIVAL (not an evisa) is available for most nationalities arriving by air. you pay US$25 in cash at immigration passport control and they stick a physical visa in your passport and it's single entry and valid for 30 days (maybe 90 now they've changed it)? so even if you've messed up the evisa information in some manner, $25 is the most the airport should charge you for a single entry visa. lots of people make mistake because they use a e-visa website masquerading as gov.vn when it's really a travel agency. and some websites even spoof the name of a reputable travel agency to fool people further. for example, HẢI VĀN TRAVEL is a well-known reputable VN/EN language travel agency within Vietnam but many dishonest people take their name and image to do their own travel business.