[Sadly]

You have probably been charged drinks (champagne) you didnt have.. Usually the trick is that girls will come sit/stand near you to take pictures or ensure the CCTV captures you and the girls holding on to those expensive bottles. You feel like a king at this moment. If you lodge a police report thereafter the KTV will use that as evidence to justify the invoice. Happened to a friend who had a similar credit card charge. He couldn’t remember of the events and was likely drugged to start with.