AGGRESSIVE CALL CENTER AGENT, INSULTED ME

1) You are trying to bill me R22,968.00 for your mistake. Spoke to three of your agents at 4pm today who literally accused me of being a ****. I asked her are you arguing with me, she literally said to me YES YOU ARE WRONG. You made a mistake now you don't want to admit to it so you are lying to me to get out of it. She cancelled my phone number that I have had forever, and literally said to me that I don't have to lie about it I can just be honest. 2) I have been trying for months to cancel my LTE simc ard. You keep sending me from pillar to post, to the store, back to the call center giving me the run around.