Also a side note in the past have called 007 and have heard children/babies in the background. Slightly worrying.
How is this worrying ?
The bookers are probably home workers, miles away from the action. I've phoned people like Baraccuda and the guy was clearly in the pub, other times I've phoned and the woman was out and about doing her shopping and had to find a quiet place to call me back from.
Not to defend the rudeness of some agencies, although they must get god knows how many texts a day, but very few if any of the girls are exclusive these days, they work for multiple agencies, so it's impossible for one agency to know who is available without phoning the girls up, so if you ask who is available at such and such a time, they just don't know.