Yep, I'd call them, but it isn't highly unusual to get the cabin assignment once you get to the port. When you drop your "checked" luggage, the porter will have a list of all the cabin assignments, and he'll mark and install the proper luggage tags on your checked bags.
Have a great cruise.
This happened to us when we did a Hawaiian cruise with Carnival in 2006. I called our PVP and even she was stumped when she couldn't find our can assignment a week before we sailed!! All she could tell me was that the cruise was sold out. We were thrilled when we gat onboard and found we had been given an extended balcony! Made for a great 12 days!!!!