You know, I would bring this up to the office manager after your next appointment. As someone else noted, (a) there may be other people with the same issue and (b) it sounds like that seemingly harmless receptionist is pocketing the money knowing it would be hard to prove otherwise. I try not to think the worst of people but I think it is no coincidence you received a bill the time you were in a rush and couldn't stop for the receipt

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