Credit nightmare

Shocking support from Vodacom. I’ve been over charged for an upgrade that was cancelled because the wrong phone was delivered. I consistently get “a credit is due”. I’ve been credited and then AGAIN, I’m billed incorrectly for an early cancellation. Which wasn’t an early cancellation. I had 7 days to cancel. And I cancelled twice with in 2 days. I’m constantly told that the consult will deal with me personally and take care of the issue. And you never hear from them. You get a sms to say the issue is resolved, and it’s not. I’ve been with Vodacom for nearly 20 years. And for the first time I’m genuinely considering moving networks. I spend between 2.5k & 3k a month and this is service I get? Unacceptable. I’ve been told the credit will reflect in 7 days. This over a month later.