He says he had no contact details for her though. Whether this is true or not is something only he'll know obviously. The only thing we do know is that she sent him a bloody invoice for £15.95 for a no show at a kids birthday party. While she has a right to be annoyed that she's out of pocket because of it, a simple word with the parent on their next meeting more than suffices, and I'm sure any reasonable person would have given her back the money. I'd refuse to pay too if somebody went about it like this.