I had a regular that occasionally worked either in MTL or TO. For security, she travelled with another provider and always booked 2 rooms. One was used as a common incall place and they used the other as 'living quarters'. I'm not saying that this is the case here, but it is a plausible explanation.
BTW, how did you get far enough in the communications to get the hotel room number (twice) and not see the lady(ies)?. Did you do some no-showin' ?