Vodacom fibre downgrade still not resolved in 3 months

I've downgraded my Vodacom fibre line in February 2023 to a R499 package 20mb line. It's been 3 months that Vodacom fibre keeps on billing me R649 for a 25 mb line. I phone in numerous times and every time I call I keep on getting the same promises that it has been resolved and my account will be credited. I was also promised a R500 takealot voucher in February 2023 by the fibre cancellation consultant which I'm still waiting for 3 months now. Can someone from the vodacom fibre cancellation department please be transparent...