Unsafe action - Cancelling my card without my permission and without notifying me

FNB cancelled my Fusion card without notifying me or replacing my card. This is very dangerous as I could have been stranded somewhere, with a flat battery phone thinking I still have access to my money. This put my life in danger. This was very irresponsible of them of firstly cancelling my card without y permission, secondly not to notify me of what they have done so that I can take the necessary steps to keep myself safe. How many other people lives' have they out in danger?