Of course not. They've already shown themselves to be a bunch of thieves. No one in his right mind would sign with them knowing what he knows. He should almost be thankful. If they weren't so miserable he might have been hoodwinked into signing a multi-year contract with them. This way he'll spend a few dollars replacing the board and be rid of them.
For them, perhaps. He, on the other hand, would be stuck with a crooked alarm company.
That's a lot better than signing up with Den of Thieves Alarms, Inc.
Only because they stole his access to his property. They should (if they were ethical) right the wrong they did. Of course they're not ethical so there's no way they will do the right thing now.
No, that's be like buying parts from someone else and then discovering the seller had locked them so you can't use them without paying him for what is yours.
I wouldn't lock him or anyone else out of a panel they owned. That was a criminal act.
If he wants it monitored he can contact