Receiving automated call daily - cannot cancel

I'm receiving an automated call DAILY, asking me to call Capitec Bank. I am not a Capitec customer. When phoning the call centre, their response is that it is probably my colleagues that have used my tel number and i need to talk to them (There's around 300 people in my building!!). Apparently they cannot delete my number from the system and can also not disclose who the person is that \I need to ask not to use my number". This is not the first time that I am going through this same process!! When asking to speak to a supervisor \""they are not available\""."""