Bad service

Yesterday I called Viacom to have a wasp service to be cancelled from my number. I was supposed to be assisted by Zimasiwe. In the middle of the conversation she decided to switch into Xhosa language which I don't know whereas we were talking in English. I asked her why is she now speaking Xhosa and her response was that I can also speak in the language I want and I told her that is not how costumer service is and she hanged up on me. I called again and was assisted by Nokulunga who was very helpful and after I asked to speak to a team leader and told him my bad experience with Zimasiwe. At 23:30 I got a call from Vodacom however those consultants were talking amongst themselves and just disturbed my sleep and they did that 3 times. Vodacom I don't think you should have people like Zimasiwe in your company as she is unprofessional and does not have respect towards the customers.