Vodacom o vodacom!!

Over the last 6 months I have tried 5 times to change my email address, providing all the details required. I note the emails are read, I also receive a confirmation, but alas, nothing happens. As a final straw, I now get a statement for an outstanding amount paid on 31st December 2020. After 30 odd years of being a client, I think it is time for a change, but the fear is that the other service providers are just as bad.