Well, I'm glad to see that OP at least returned.
Originally Posted by
Revelly
...such as being charged an amount of 500 yen extra from our accommodation in Hakuba...
I'm inclined to think that this one, at least, can be easily explained for you: this sounds like a hot spring tax.
Originally Posted by
Revelly
The dishonesty is epitomised by the erroneous transaction of Motonago ryokan that make the false claim that the payment must be for another ryokan when we clearly did not stay at another ryokan and they cannot claim that it was another establishment within their network as they operate independently.
Did you make your booking through a third party that handled the billing? What name does the transaction appear under on your credit card statement? If the payment was handled through a third-party agent, you may need to contact them directly.
If you don't mind sharing, what was the amount you expected to pay in JPY, and what was the amount you were charged in JPY? If you were just looking at the USD amount, it's possible that exchange rate or bank fee issues help to explain where your additional cost is coming from.