Rude and pestering call Centre staff

Received a call from a “no caller ID” number at 9.04am today (Saturday). I have been plagued with unidentified calls the whole week - sometimes as much as five times a day! This morning, I decided to answer and Sizwe from MTN asked if he could please speak to me. My response was no, and I asked if I could please be removed from their calling list (I am assuming that the no caller ID pestering can only be from MTN!). Sizwe however, decided to simply hang up on me immediately. What rude *********** people you hire. It is very upsetting to be pestered consistently without consent (including over the weekend) and then to be abruptly cut off. Train your staff to have some basic manners and call Centre s****s - it is absolutely upsetting and pathetic. Furthermore, remove me from your call list.