Never had any real issues from No5 via wechat.
I have experience cancellation eg I book ahead of time but few hours late they message me saying girl not feeling well or something and offer to see someone else.
I dont think much of it nor take it personally.
And these girls are first time seeing them aswell.
However I have experience maybe long wait times like 10-15min wait in the room...

Sounds like your ego for bruised and thought they cancel upon seeing you. Maybe or maybe not. The world doesn't revolve around you.
If girl cancels. See someone else