Address change magically back to old address

I changed my address in April 2023. April and May statements had the new address. Since June all invoices and statements are back to the old address. How on earth ... I send an email to this effect on 12 September 2023, still awaiting a proper reply... This is such bad customer service. The reply tells you to chat to a TOBI robot - who can't assist you with basic queries. If I could I would cancel all my contracts with Vodacom immediately.