Call centre, please answer the phone!

I have been holding on the line for over 16 minutes to talk to the call centre (no exaggeration, I can show you the screenshot of my call just before I gave up waiting). I need to query incorrect charges on my bill so cannot use the self-help.<br> <br> Please guys, answer the phone!! It is simply not acceptable for clients to have to hold on the line for over 16 minutes to talk to someone - especially for a company that is in the telecommunications industry. Even Telkom gives better service these days!<br> It is also not acceptable to say that I may have to wait longer due to high call volumes - you should give me an option to call me back rather than me waiting on the line for ages.