I am another confrontation-hater, and I have NO problem just not answering the phone for people I don't want to talk to in my normal life. I'm okay with that being passive-aggressive, because it's my phone and I will answer it when, if, and for whom I feel like. But I'm extremely covetous (is that a word?) of my
Disney vacations, and there is no way I would go in to one of my magical trips with this crapola hanging over my head. Looking over my shoulder at Disney?
I am curious, as a PP, about how your wife feels about all this. If this was going on with some jerky aquaintance of DH's and it had the potential of irritating me on MY trip, I might be too much of a wuss to call and tell them to back off, but I wouldn't hesitate to send an email. If it was the last straw with the person, I might tell it like it is. If I wanted to be nice, I'd just say, "This vacation is our family time, DH will see you when we get back!". If DH didn't like the fact that I was playing "Mommy" and getting rid of the person for him, then he can (and dang well WILL) handle it before it remotely infringes on my Mickey time!
Oooh, I just got a little snarky there! And DH WOULD handle it, I'm sure. But apparently it makes me angry to even think of anyone hypothetically getting on my cloud!

OP, please do handle this and don't put your wife in the position of dealing with it.