I got an ABC taxi from Hanoi night market at 19:00 to the Airport terminal 2. It seemed legit: clean, with the sign on top and all. Followed the meter and got a receipt.
He charged me 1.8 million VND, so obviously that was a scam.
How did I got cheated? Was it a counterfeit ABC taxi or a fake/hacked meter?
Edit : Found the answer... It was in a fact a COUNTERFEIT taxi !! It even made the local news : http://dantri.com.vn/xa-hoi/du-khach-phap-di-taxi-du-tu-pho-co-ra-noi-bai-het-21-trieu-dong-20171006164024103.htm