Calling back to the hotel will get you nowhere. The hotel's telephone number goes to a call center that could be in Minnesota. (That's true even if you call the "front desk" from your room phone - the call center answers as if they were at the hotel.
OP, another option would be to ask the desk to "hold" the packages for you. Then when you go back to the resort, tell your family that you got a message to go to the front desk (or Bell Services) - they can hand the surprises to you, saying Mickey dropped them off. Your daughters will be as surprised as if they were in the room. Then they can be excited as they run to the room to open them. Anticipation of a gift can be as much fun as the gift itself.