Crazy French speaking Arab guy says we have a "signal leak" (the best my wife could translate) won't give me any specs, which, if we really did have a "signal leak" he should be able to give me the numbers.

1- the number he is calling from does not belong to videotron.  if there was a videotron signal leak, it would be videotron to deal with it, not a third-party authorized by videotron.

2- all of this can be handled remotely, no need usually for a technician to come out.

3-in the instances a technician comes out, these issues can be handled outside the residence, and a technician would never need to enter your premises or make an appointment with you.

4- if there was any issue with the equipment inside your home, videotron will either let you bring your equipment into a store front and swap it out there, or send a videotron technician out, in a videotron vehicle, never a third party.

5- if you call videotron about this matter, they will have no idea what you are talking about.  So not sure what they are trying to sell you or scare you into buying or subscribing to.