Your can disable the card through the website or the app. Maybe by phone but I would have to check. You can of course do it in person too. The store HAS TO give you the receipt and all transactions are sent to the tax administration. If they were to take more, and somehow do it in a way where you wouldn't notice it by the time you've left the store, your can still take legal action and the bank can revert the transaction.

In speaking for how it is in Slovenia, it might be different in other EU countries.