Airtime doesn't go through, bank account debited

Nedbank, once again, is making my life more complicated than it needs to be. I am currently running an NGO project with community health workers. I bought some airtime for my community health workers, since they need to contact me on a daily basis about their clients. I bought the airtime using Nedbank banking. Nedbank debited my account, but no airtime was sent to the health workers. I phoned Nedbank, and they said they would resolve the problem in 3 to 5 days. Meaning that now I have to drive 50 kms and back to the health workers any order to physically give them the airtime. Nedbank just doesn't seem to care about their smaller clients. How are we suppose to operate efficiently if our online banking doesn't work.