Debit order cancelled without my knowledge

We have signed up for Vodacom fiber in 2021 with a debit order. This week, our internet line has suddenly been disconnected. I phoned Vodacom to hear what was going on, they told me the debit order was stopped 6 months ago and that our account is now in arrears. Note, that we never gave instruction to stop the debit order, nor were we informed of any changes to our payment arrangement. The invoices we receive monthly also doesn't show any outstanding amount. When we tried to resolve the matter, we were informed that we were handed over to some attorney. I am so disappointed in Vodacom's billing department once again. We haven't received any communication this last 6 months that we owe Vodacom money, no information was communicated to us at all. They are giving loyal customers a bad credit score with there incompetence in sorting out billing errors and the correct procedures are never followed.