Cell C contract that has not been terminated

I have a contract phone with Cell C, which I been using for many years, and extended multiple times. Last year, 2025, I called Cell C at 084 135 informing them I would not extend the contract with Cell C anymore. I made a call on 20 August 2025, and when I noticed is till debiting i called them again on16 September 2025. Cell C continued debiting, although I made two attempts indicating I am not extending the contract. On 31 October 2025, I received an email from the collection department, saying they did not receive the installment of R 824.98 I responded to their email to tell them this contract that are debiting contract, has come to an end and I have already called 084135 to inform I will not extend. It seems all my attempts were going to the deaf ears. Cell C continued to debit and when I called today, 09 January has not cancelled my contract after all these attempts.