Contract cancellation and wrong billing

I took a 3 years contract with Vodacom which ended on the 19/12/2024. I called Vodacom on the 19/12/2024 to cancel the contract and the consultant that I spoke to advise me to call on the 03/12/2025 as it is already late which i found strange. she also advised me that if I call on the 03/01/2025 I will not be charged at the end of January for this contract, I called again on the 06/01/2024 and spoke to Thamsanqa and we could not finish the call and I asked him to to call me back after 1:30 during my lunch and he did not and discovered that my contract is still active. I called today and spoke to a lady who was was friendly and willing to help, during our conversation I discovered that even if they process the cancellation today i will still be charged as im suppose to give 30 days notice, and I also discovered that the second contract that I took with Vodacom was suppose to come with a rooter and a sim card which I did not receive meaning I have been paying for a data that I did not use since 2023.