Trying to change banking details for future debit orders!

I have switched banks and I am trying to inform Vodacom of my new banking details in order for my monthly Vodacom debit order to go off at the end of the month. It is IMPOSSIBLE to reach a human being to talk to. I have phoned all the numbers provided and it always take me to automative voice message with multiple selections to choose from and at the end the automated voice tells me TOBI will chat to me on whatsapp. Well, TOBI can't help me with that! I went on the Vodacom app and website and oh my, what is that? It has a million options to choose from and still can't find the right pathway to edit my account details related to debit order change. NOT a user-friendly app or website. This is ridiculous! This entire process has aggravated me so much, it wants me to cancel my contract with Vodacom, nevertheless trying to get in touch with them to pay them!