Incorrect phone notification

Hi<br> I have been Nedbank user for over 4 years, it upset me to that when i am swiping for purchase i get false notification balance. It is not the first time i experience this and i was told it has been resolved until yesterday when i discover that the money that i have deposited on the atm which reflected as my available has not cleared. If my phone notification show me the balance i trust it and know that i have that kind of amount so now if on the later stage i discover that its actually incorrect that means its **************** as i am paying for such services. I am very upset as this matter leads to me wondering if Nedbank is managing my finances correct as their system is able to send me false paid notification.