Cell C double billing

I requested an upgrade mid Aug 2025 to a sim only elevate 2 from my Pinnacle 2 . A few days later I called to change it to an Elavate 1 with a device. The agent said they will cancel the Elevate 2,but did not tell me I will be charged for it until the end of the month. End of Sept, I get a bill that charged me for the Pinnacle 2 from mid Aug to 31 / 08, Elevate 2 from Mid Aug - 31Aug and Elevate 2 from 22 Aug - 31Aug . The only benefits for this period was for the Elevate 1.in addition, at the end of Aug I was billed for Pinnacle 2 from the 1 - 32 August. So in essence, I was double billed for Pinnacle 2 for the period of 19 August to 31 August 2025. I lodged a dispute. An agent calls me on Sunday, but cannot seem to comprehend this double billing for the Pinnacle 2. How on earth us one charged in the Augyst and September statement for the same period of time for the same package . I can understand thst they would charge for the Elevate upgrade, but why charge on the Pinnacle 2 which I had already paid for the previous month, for this period. So in essence I am paying twice for the Pinnacle 2 from the 19 -31 Aug, once for the Elavate 2 for this period,and once for Elevate 1 from 22 -31August