the org. Its generally individual girls who block individual customers. However, if multiple girls block the same guy for the same reason, then oftentimes the booker will go ahead and make the block agency-wide. The exception is when it comes to going overtime. If a customer is chronically going past the end time of the session, then its usually the booker who blocks the customer, but again, its sometimes prompted by complaints from the girls.
Just to expand on that a bit, its up to us to get out on time. There is no legitimate excuse to run overtime. If you are late arriving, your session still started at the time you booked and ends an hour (or whatever you booked) later. The average break time is 10-15 minutes, where a girl has to change the linen, freshen her makeup, pee, and be smiling and ready for the next customer. If that gets shortened by the customer hanging around too long, it means she is going to have to cut out some of the prep for the next customer. Do you really want your BBFS girls to have to skip the douche between customers because somebody went over? LOL
I'm always amused when I get a PM from a guy who doesn't know why he is blocked, but when I go to his reviews, he likes to brag about how a girl "liked him so much", "or was so into sex with him," that she went overtime. SHE doesn't go overtime, the customer does. They will usually not confront you about it, but after you leave, a simple text to the booker makes sure you won't do it again with them. Just because the girl does not jump up and throw you out when the clock strikes the hour does not mean she isn't pissed about you going overtime. They know that making a scene at the incall will end up in a negative review. Silently blocking your next visit will not. Chronic overtime is the most common reason for an agency-wide block. .
I'm just giving an example of the way the system works. I agree its frustrating when you are blocked and don't know why, but its important to try to find out, as SD recently did, so that it doesn't happen again with another girl in the future. There are many subtleties in this biz that take awhile to figure out. That's why its important to try to find out if you have done something to get blocked.