Pathetic response from Vodacom

I contacted Vodacom on 23 September 2023 to cancel my data contract because I don't use the data and only work off Wi-Fi. On 09/10/2023 I received an invoice for R1328.78 for internet line. I NEVER signed up for this. I phoned Vodaycom on same day to enquire. First I spoke to Annie and she transferred me to Ursula. Ursula assured me that someone will call me back. Reference number ***. Never got a call. Phoned again 16 Oct, spoke to Thembeka and then to Simon. Phoned again 3 Nov, spoke to Tracey. Phoned again 13 Nov, spoke to Samiska. Every time I called, I was promised that a manager will phone me back. Still waiting. In the meantime I received another invoice on 10 Nov 2023 with amount R1328.78. Why on earth would I cancel a contract of R121 per month which I am not using and sign up for R1328 internet line ???? I asked all the agents to retrieve the voice recording of my call on 23 September, but NO feedback. If I do not receive response within the next 3 working days, I am going to report Vodacom to ICASA. If still no joy, I am taking legal action.