(((((((((((((((Lolly)!)))))))))))))!
Whatever you do, make sure you are doing it for yourself. If you don't want to talk to your dad because it drives you crazy... then don't. If you're driving yourself crazier and trying to affect his behavior by letting the phone ring, maybe? That's what letting go is all about. It is not wrong to interact with the person, it is only a mistake to tailor your behavior to fit theirs in the hope or expectation that they will change because of your action.
Love,
Smoke