FREEZING ACCOUNT WITHOUT NOTIFICATION

i was at the garage this morning and i filled petrol and i dont ever carry cash so i swiped my card and it declined. i tried another machine-also declined- this was very suspicious so i went to check what was happening at an atm which didnt give me any info except to say my card is rejected.i called standard back and they now said they had frozen my account to update details.this is totally unacceptable as i didnt have any cash on me and i wasnt allowed to leave the garage until i paid the money- should standard bank notified me before doing this it would have avoided a whole lot of embassessment. this is seriously not on!<br> im a customer and i expect to be treated as such.