They are all full tonight but can move us tomorrow which is not a easy feat with little kids.
Just don't unpack much, hand your bags over to Bell Services when you are heading out for the day, and then when you get back have Bell bring them up to your new room.
Whatever you do, seriously, do NOT wait around for that room. Well unless you were planning on a resort day that would be spent swimming, etc, anyway. Otherwise, keep your fun plans for tomorrow. I hope you're sleeping tonight.
Moving is a pain. It's more of a pain if you sit around and wait. We made that mistake on our first/only time at Jambo. Not worth it.
It sounds like you wanted to take the bus. If you do, request that. Remember to only talk to the front desk when you are AT the front desk. Calling, and even being called, doesn't mean you're talking to someone inside the resort. Even being called back by "a manager" doesn't mean that's a hotel manager; can just be the call center manager (this happened to us at Jambo). Go to the front desk, talk to them in person, face to face.
Face to face, you will very likely find out that AKL is very used to helping people who have been seriously inconvenienced. Let them help you in that way. They seem to respond well to being asked what THEY think is appropriate, and then you just stay silent while they work it out.
If you've resigned yourself to the van, request to be closer to where the van is parked. Or just send one person out to get the car and have them come around to the front, to pick everyone up.
At the parks, do you have a plan? Wheelchair, accessible parking spot hangtag, etc? Those lots are big! So if you don't have wheels, etc, I would try for the rooms closer to the bus areas. Give yourself lots of time at the bus stops, by the way. The absolute worst bus service we have dealt with more than once has been at Jambo and Kidani.
Lastly...that 50 hour car ride has sucked out your joy. While I'm not saying you have no reason to be annoyed (would I have responded with all of those sentences if I felt that way?), you are likely MORE annoyed than you will be tomorrow as long as you've gotten sleep tonight. Things WILL feel differently tomorrow. Especially if you just pack everything up, hand it off to Bell while the people at the front desk work on getting you a different room, and go have FUN.