The OP said he had some "two dozen transactions " with Celebrity. And that he would have noticed a larger amount.
Anyone had a cruise with two dozen transactions with Celebrity?
Seems not the TAs fault, but rather a bit of chaos from the beginning.
If he didn't notice a $300+/- error in his statement why such a big deal paying it?
I have gone to checkin and been told I owed $$ regarding a MoveUp. Had a choice pay it or not cruise.