Bad service

I had a bad service with nedbank and i have had enough to a point that i am considering change banks, today early morning at about 01:00am, i went to a garage with confidence to pour a petrol (full tank) knowing that i have funds in my account, but when i swiped my card, it reflected insufficient funds, the attendant did it twice but it reflected the same message, i then went to an atm for a withdrawal as i needed to pay but it still reflected insufficient funds, i then called the call center and they advised me that its due to maintaince, i was in the middle of nowhere with no cash and did not know what to do and had funds in my account, i had to wake a friend up to come pay my bill where else i had money, nedbank made me look like a stupid and a lier, i am totally not happy with this riduculus service as to why dont customer be notified that maintaince will take place from this time to this time and do not attempt to withdraw...Prince Fanyana Shiburi