Vodacom de*****ed me of my airtime while using MyBuy5 bundle

So Vodacom, you have this bundle you buy called MyBuy5 which gives me 60 minutes to call people that I've added to my friends list on the menu, for only R6 instead of using airtime. Only this time my call ate through all my airtime, but get this... my call also used the minutes from the MyBuy5 bundle AS WELL. I'm very angry because I had over R100 of airtime left and nothing now, even though I bought the MyBuy5 bundle and spoke for just short of an hour. Am I just purchasing your bundle for nothing then so you can de***** me of my airtime then? It has worked fine in the past, but now your service is broken