Vodacom purchase not supp****

I purchased data from vodacom a while ago. I paid for the data on vodapay using my Fnb app. After Confirming the purchase online I never received my data. I queried it with vodacom and I was told that they can't see the purchase on their system and that I should take it up with my bank (FNB) to see if they can help. The lady on the other side of the line was not very helpful. It seems that it was a real effort just to speak and breathe. It seems that I have donated the purchase amount to vodacom as my bank can also not help.