Disappointed by FNB

A supply promised me a services free of Charge and asked my to register my card details, now i see transaction of R589 in my pending transactions. and FNB says they cannot help me because i was reckless with my account details. the question is how was i suppose to know that it was a false promise. i think FNB must have a better way of dealing with this matter because the supply breach their agreement. for that matter their no where to be found.