There have few suggested legal actions in court and consumer protection law against this mini bar issue.

From my hundreds of lodging experience, not just Hilton hotels and not just hotels in the U.S., erroneous billing has been very rare event. I am assuming that is the case for most of hotel guests. I do not think every day more than half of hotel guests are receiving erroneous charges. I do not think any law states that establishments cannot make erroneous charges under any circumstances at all. Mistakes do happen and if it is not routine event and if it is not intentionally done then I do think consumer law does not apply to such erroneous billings.

In case of mini bar, beside a policy in writing I have verbally mentioned to be careful about the mini bar devices and some cases I was asked if I wanted a key to mini bar fridge. I have not felt a hotel was maliciously trying to deceive the situation with mini bar situation. Is there really any consumer law violated here?

Handful of situation where there were erroneous billings the situation was resolved in very swift timely manner. Once I had restaurant charges and the charge was billed at 9:30 p.m. on July 4. I was visiting friends for July 4th and at that time I was with my friends watching July 4th firework. Charge was removed immediately when I inquired at the check-out. Another time there were phone call charges, not that I did not use in room phone, the time of call was listed when I was at the conference for work and I was not at the hotel room at all. Again, charges were removed at check-out when I inquired.

As the case of OP, when contacted Conrad Hong Kong the charges were removed. Like in my situations and OP’s situations when the dispute was resolved in timely manner with satisfaction of both parties, then again do consumer protection law applies here?