Reversal gone wrong

I made error by saying extra to supplier I called they said the can't reverse it I must talk to supplier of which did and was sorted,then supplier calls to say they haven't received the funds and I get a case number from Capitec and initially I was told there's nothing there can do,now I have supplier on my neck because of them investigating. My irritation is that they said they help I made alternative arrangements now I'm sitting with a problem,to add they charged me 70 reversal fee.