Call centre is a waist of time

when due for an upgrade I chose to use the call centre. After being on hold for 14 min and eventually getting through to the correct department I was told they will have to phone me back! Two days later I still never received such call. After the second attempt of contacting them again, I managed to get the upgrade done. Then I received the new phone with the sim. Contact the call centre agai to do a sim swop. Again I was told they will phone me back. After 2 days of not receiving a call back I whent to a cell c store at Carnival mall to manage to get the sim swop. Only to be told I have to pay R140 for a new sim cause they can't use the sim that was given with the upgrade phone!!! What a complete waist of time contacting the call centre. They just cost me anther R140