Last time I was in London, I didn’t swipe my card correctly and so I got charged for several “incomplete journeys”. I filled in an online form explaining what had happened, and received a refund a day or two later. Great service.
Then, back in Hong Kong I went to meet my wife on an MTR platform, but she wasn’t feeling well so we exited the station. I was charged HK$9.8 - it turned out I had been in the station for 22 minutes, and if you enter and leave at the same station more than 20 minutes later they charge you HK$10.
I fully understand why they have this charge, but it is slightly ridiculous because if you want to circumvent it you simply travel (let’s say) from Wan Chai to Tsuen Wan and straight back to Admiralty and you will only pay HK$4.5.
Anyway, I tried to explain the circumstances to the station staff, but of course (this being Hong Kong) they have to fill in a form. A few days later I get a letter explaining the relevant MTR byelaws and hoping that this clarifies the situation.