59 day cancellation period instead of the 30 days in there terms and conditions

I sent through an email to cancel the LTE internet/WiFi that I currently have with supersonic. The email was sent on 1 January 2026, there terms and conditions state one calendar month must be given for cancellation, they only acknowledged my email on 6 January 2026, and sent me an acknowledgement email, stating it will only be cancelled on 28 February 2026, that is 59 days in total, and as a customer I did the correct process and sent the email on the 1st , one calender month, 30 days, and they are only acknowledging it for February. Secondly I want to get an airfibre contract with MTN, and asked if they could just upgrade the packages, and refuse , and said the supersonic must be cancelled before I can proceed with a new package. There has also been no correspondence since my last email, asking them to please contact me, as I have queries about the cancellation as well as returning the device,they only call when they want to make money and sell you more products, but never get in contact to assist when you have concerns with them