POOR RECEPTION

If it's not the inability to withdraw at the ATM it has to be the inability to transact via mobile app. I have have made numerous efforts to withdraw my money, only to have the ATM cough up my card back with a notice saying 'This transaction has been cancelled.' Via sms I receive that there has been a correction. I do not understand how and why. Fortunately my money is still there.

Then there is the transaction via app. I have been trying to buy airtime but to no avail, it just says service provider unavailable. I am so annoyed. Can't we as clients receive a prior notice at least?