Nedbank making things not happen

I bought airtime via netbank on the 1st May 2018, to date my account is still not topped up. I called my service provide and they assured me that the problem wasn't on their side. I called Nedbank in the morning and they gave me some lame excuse about the airtime being bought on a public holiday hence the delay but assured me that the money went through and the airtime should be received shortly, 6 hours later I am still sitting waiting for the top up and no one bothered to call despite being told that someone from Nedbank will call and my problem will be solved urgently.