Sworn at by the outbound call center agent

I received a call from the Capitec Bank call center and the agent who called me was downright rude. It is unfortunate that I did not get his name, but the call was received on Monday 20 November 2017 at 07:46am from the number ********** . After The call, he called me back, but the I was so upset and saw no reason for him calling me back, so I ignored the call. He then left me a voice message, calling me all sorts of vulgar names.

I demand action be taken against this agent who is supposed to be the voice of the company, yet, how he portrays / represents it is appalling!!