Nedbank Private Clients doesn't want business

So twice I've approached Nedbank private clients. Both times they take min 3 days to respond to my mail. I then set up a time for the person to phone me and she doesn't phone me during that time. So I complain on their complaints line and I get a mail from them that complaints are trying to contact me and can't. So I explain to them, I get at least 4 spam calls a day so tell me when you want to phone me and I will answer my phone. So they randomly call me again and I don't answer and then I get a mail saying they can't get a hold of me, although the woman is mailing me and I'm replying to her to set up a time when I am available so I am clearly not 'unavailable' and that's your 'customer resolution manager'. It's like a chain of comedies.