Deckman, since your position is from a sort of "911" position, just say:

"I am sorry, I am waiting on an emergency call from the hospital,PLEASE Remove me from your calling list immediately." and hang up. The calls should stop fairly soon. If they don't, call the FCC---Federal Communicatins Commision, and tell them that your line can not be tied up at all because of probable in coming emergency calls.

When in doubt speak to the Horses Mouth. I will go look for a toll free number for the FCC........