Disputed debit orders

I have not been a Vodacom customer for years. On 2023/11/17 my account was debited with reference number VODACOM *** I*** On 2024/01/02 my account was debited with reference number VODACOM *** I*** I checked with the Nedbank online chat assistant and they confirmed that Vodacom gave these debit order instructions. I made it very clear that I am not a Vodacom client but the assistant kept on insisting that I should follow it up with Vodacom. All Vodacom contact channels require you to be a client, so to try and sort this out with them is just about impossible. Why can't a client query a debit order with the bank (who is being entrusted to keep my funds safe) in such a way that the bank will query the debit order instruction with the source company? To expect the client to figure out how to get to the correct department in Vodacom or to open a SAPS case and hope that something will one day be done about it, while someone keeps on debiting my account whenever they feel like is ********** customer service and not doing much to convince me that the bank cares about the safety of my money. Please get someone that can provide proper assistance to call / contact me as soon as possible to clear this up.