I think they're genuine girls however just run by one guy (called vince)
I've tried to book a few of them years ago and was messed around though. They're no longer part of the group these days. One of them was quite new and didn't believe I was who I said I was, asked me for a picture etc, so I just cancelled.
If you send a message with your number I think the guy then passes on your number to the girl. I remember waking up one morning to a voicemail by one of the girls listing all of her services
For the dollar there are a lot better girls out there who won't mess you about and don't look off their face in all of the pictures