The booking confirmation included the following terms: if the customer purchases additional products or services at the store (such as vehicle upgrade fees, insurance fees, additional drivers, and extended rental periods), they must pay the corresponding fees and related taxes. We have no objection to this. The problem is that although there was no vehicle upgrade, no additional insurance, and no extended rental period, but only an additional driver, the taxes were not calculated based on the additional part but were recalculated on the entire amount, leading to duplicated taxes. This could either be due to an overcharge in Munich or due to Rentable Cars not providing a detailed explanation.