Vodacom

I am struggling with Vodacom. They are not putting through my debit order. Then the next month I have to pay double the amount and an overdue fee. This is making my credit score bad. It is not that I don't have the money in my bank account, because I do - the Debit order is just not going off. I tried Customer Care and they also were no help. I tried using the Vodapay app, but had technical issues and then my user ID got blocked. I am really not happy with Vodacom at all.