Useless service

On 5 September 2017, I scheduled a callback regarding my MyVodacom online account. I believe the company promises to call back within 24 hours. Today - 25 November - I decided that its 24 hours was a bit longer than mine, and I again called the customer care service centre. I wish to change the username of my MyVodacom account to my email address rather than my phone number. But this is not possible, I am told today - even though the account makes provisions for your username to be either your phone number or your email address. The upshot? Although I have two contracts with Vodacom, for which my bank account is debited monthly, I cannot manage my accounts. I wish with all my heart that I did not need a cellphone. I have tried three different service providers over the last 25 or so years; they are all as bad and as expensive as each other. And none get any better with the passage of time.