“VBox” is the brand name for video disc rental services from fully automated and self-serve kiosks. There are 29 VBox kiosks throughout Hong Kong at convenient locations in shopping malls, residential complexes, MTR stations and convenience stores.
VBox carries over 100 movie titles with a wide selection of latest releases. The choices range from adventures, comedy, drama, western movies, Hong Kong movies, Japanese/Korean movies, TV series, animated cartoons, action, etc. You can choose between Blu-Ray, DVD, or VCD format.
After selecting, you can pay for your movie by Visa, Mastercard, or Octopus, and out it comes.
Your movie must be returned to a VBox kiosk by the time specified.
I'm not sure who you can talk to if you have a complaint about a rental disc. Perhaps there is another vending machine for customer service.
You can read about other kinds of Hong Kong vending machines here.