The police bust incalls on a "complaint basis", meaning they don't go looking for them. However, if a neighbour complained to the police about the incall then they might bust it. It's not like it never happens, but it isn't aggressively enforced.
On the other hand, Ontario courts have generally sent a first offender to "john school" rather than an actual conviction. Obviously there's no guarantee, especially if you are unlucky enough to visit an incall where some underage girl is working (even if not the one you see, the police might try and make an example out of anyone found there).
So, the odds are you won't be arrested, and if you are you will probably face only the public humiliation of standing in open court and being ordered to attend john school.
But yes what you're doing is a crime in Canada and you could be charged and convicted, and nobody can tell you otherwise so long as this law is on the books.