Invalid penalty fee, Rude customer services

I phoned Vodacom prior to my debit order date of the 25th to advise of an issue I had with my bank and requested to make a manual payment at Vodacom directly. I was advised the debit order can not be stopped and I needed to make a manual payment. Which I did. Now I'm getting collections smses with regards to a R100 penalty fee, as if I missed my debit order when infact I already made a manual payment at a vodacom shop. I phoned your customer services to query this and then got transferred to the billing department, this lady was so rude, telling me someone should have told me about the penalty fee. How does this help me? This is not fair. No one told me this and secondly I already paid. It's not enough that we pay exorbitant prices for staying connected we also need to pay through our noses for \penalty"fees when life happens? """