Okay...I see... I do believe that we need to follow our instincts in these situations, because most of the time they are right due to inconsistencies with our S's behavior.
Frankly, KAW, if it were me, I would confront her...big time... That's me, though. You seem to be a bit more mild-mannered. After all the work you've put into your R, after all of the sacrifices you've made, after all of the letting go you've done, you are entitled to some respect, my friend. Good DBing? He!!, I don't know, but sometimes enough is enough, you know?
But before doing anything, I think you should really be sure...get your ducks in a row. I assume you know OM's name? Perhaps you could call the cell number and confirm the name before going into some kind of phony sales/marketing spiel for some bogus services. As soon as you start the phony spiel you could "accidentally" hang up. He should be none the wiser...if it's him. Of course, if it isn't him, then you'll still wonder who it is...