Sorry OP, but last night I mistook Santa for a burglar and knocked him out with a frying pan. He's currently tied up in my basemant as I'm not sure what to do with him now.
Ok first things first: stay cool, don't do anything dumb.
Second: Contact the Elves at the North Pole and start talks. Tell them you have St. Nick and you have a list of demands you wish to make.
Third: If they refuse to listen, tell them there won't be a Christmas next year.
Forth: If they give in to demands, let the poor fat {Beeper} go.
Fith: Profit.