vodacom bad customer service

I notified Vodacom on 12 january 2024, let vodacom know my change of banking details. But they still tried to debit my old account. Because of this they charged me over R80 for unpaid debit. That was January, now in February they did it again. I phoned and ask why they are still debiting my old account. I've notified vodacom in january that my bank account info have changed. So the they finally change it. My question... Why have a email:***. if it does not work. Now i have to pay 2 monts of penalties for Vodacom's bad customer servic