Should I start to make multiple appointments?

[El Gordo]

I turn up and the escort fails to make the appointment. This happens 80% of the time - I am keeping count.

For me this is more like 20%. Recently less than that. If you are having an 80% n/a rate then I think at least one of these statements must be true:
1. You are somehow drawn to flaky escorts.
2. Something in the way you book is making escorts think you are flaky.
3. You are very unlucky.
It's hard to tell which of these is happening without more information.

Hun why have you not written reviews for these so called 80% that have messed you around???

That's certainly an option. I have done this in the past: Escort Ireland - Escort Reviews - Review 012185 - Irish Independent Escorts, Irish Touring Escorts, Irish Escort Agencies
Before writing that review I pm'ed the escort to ask whether there was some reason she hadn't been able to see me or cancel. After all, emergencies do happen sometimes. Only when she didn't reply did I submit the review.
I find it helpful when people write n/a reviews. I'll be very wary of booking an appointment with an escort who has a reputation for double booking, especially if I have a limited time window.