Call Centre Agent Answered and put the call on mut

I've been trying to call the Momentum Multiply call centre the whole day and only to be told that all the cell centre agents are busy on the line. Eventually I got through to a call centre agent named Andrew, he pick up and put the call on mute and kept me holding. As I am writing this complaint Ive been holding for over ten minutes. I can hear him talking to other agent in Afrikaans. and he is blatantly ignoring my call. I cannot understand why would a company employ such people!!! this service is appaling and totally unacceptable!!! I demand that you listen to this call and advise me of feedback ASAP!!