IME credit card companies can't do anything until the charge clears (which may take a few days). So you'll see the charge is wrong, but you can't do anything about it because it's still pending. Given that it may also take a few business days to resolve the underlying problem (it may have been an issue with the driver misquoting the price initially, so there may be a back and forth there) a week is a reasonable amount of time to wait. But absolutely you should notify the credit card company immediately, in order to start the clock