Something similar happened to us on RCCL...only it was our fault because we didn't completely check our bill. When we got our final statement, we quickly looked at the balance, it seemed reasonable enough and so that was that. It wasn't until we got home and I was going over our vacation bills/statements that I took the time to read the RCCL final charges 'line by line'. OMG there were numerous small charges that we never made or were in error. But it was way to late to complain and we HAD the opportunity on board ship to address the billing errors. Oh well....hard lesson learned...won't do that again.