Such transactions are deemed to be authorised by the cardholder as the card was presented to the merchant and the sales draft signed by the cardholder.
If you are forced to sign for a transaction or make an ATM withdrawal, you should immediately report the incident to the local police, if it involved unlawful detention and/or threat to bodily harm. You should also immediately contact your card-issuing bank for assistance. On a best effort basis, the card-issuing bank will take up the complaint with the Card Scheme and the merchant’s bank for a resolution.