A couple of my friends from Beijing were ripped off today, they were charged $140 for a taxi ride from Tsim Tsa Tsui to Causeway Bay. It was their first time in Hong Kong so they wasn't certain about the charges, apparently the taxi meter was showing $45 but the taxi driver told them they had to pay the taxes and tunnel charges.
The later on in the day while I was in a taxi with them talking a mixture of Mandarin and English, another Taxi driver insisted I gave them a $20 dollar note when I gave him a $50. He started laughing and apologised when he realised I spoke Cantonese.
It seems speaking Mandarin in this place is a license to be ripped off.
Whats the best way to get their licenses revoked? Would a receipt be enough?