Rondathehonda

We returned from Holland America Konningsdam June 4/22 from Alaska. When we checked our bill on the TV, it was correct except for 1 bottled water and 1 can of Coke from the fridge. When we got home, we were checking our visa statement and found we were charged an extra $96. I have tried repeatedly to reach Customer Service with regard to this. I have made at least 6 calls. I waited 2 hours on hold only for my phone battery to die, another time I called and was told to call between a certain time PST, but I was calling at 11:am, within the range. 2 more times waiting on hold until closing time. I got through the last time and spoke to somebody and gave them the information, only she told me her computer just went down. She said she had my information and would email me with a reply the next day. That was over a month ago. I tried again today after talking to a different agent about a future cruise. She transferred me and again I sat on hold until their office closed. In between the phone calls I have been emailing them with this information asking for them to return my call. I believe there have been at least 6. So far crickets. I emailed the ship through the App and was told it was out of their hands and that I had to contact Customer service. I sent them another email asking if they could forward my complaint through internal mail - they said they would. Still nothing. Short of showing up in Seattle and knocking at their door, what else can I do?