Worst Customer Service

Today, I got a call from a call centre agent in the contract upgrade department. Her name was Yvonne. I have never experienced such rude, arrogant behaviour from a customer service person before. She firstly was extremely rude when I answered, I’m extremely busy and explained to her that I renewed my contract already, she asks me when, I could not clearly remember, then she mentioned November, so I said to my Colleague why is she asking me when I renewed it and under her breath she says I was confirming, in the most rudest arrogant tone. I cut the call. She calls me back and I asked her why she is calling me back, when I said to her that I had already told her that I am not interested in upgrading, I raised my voice because I was by now frustrated, she further goes on to antagonise me and question me why I am shouting at her. I lost my cool and I cut the call. So does all MTN Customer service agents call their customers to antagonise and pick a fight with their customers????? Because of Yvonne, I will be moving my contract to Vodacom. Your customer service leaves a lot to be desired and your constant badgering for me to take up contracts is so distasteful and highly frustrating