Changing bank details is very difficult.

I've been trying to migrate my Vodacom month-to-month account from my personal bank account to my business bank account. I started this process in July this year. At first I was told that there's something wrong with their system. I phoned back a few days later and I was told to go to branch, which I did. While at the branch I was told that I can't do it at a branch, I need to phone customer care. I phoned customer care again. After being passed from one person to another, I finally got an email from Vodacom to say that I need to send outstanding documents to "***", which I did in September. It's now November, and nothing has changed. My personal bank account still gets charged instead of my business account.