Month to Month ontract changed to fixed contract without consent!

My mother Zelda Gerber *** took a month to month contract for me with cell C for minutes and data in October of 2021 because we were in the process of moving country. now when we want cancel it am told that the contract was changed to fixed to July 2023 without my consent.... and did not receive any information regarding the updated policies etc. Only today (20 August 2022) cell c sent an sms :

Dear Valued Customer.

We have updated our terms and conditions to include an early cancellation penalty, which will be effective from 2021-11-01. Please click here https://www.cellc.co.za/cellc/subscriber-agreement to view our updated terms and conditions, which also outline your options regarding any changes to our charges. Please call us on 084 135 or email *** should you have any questions. Cell C".

We refuse to pay cancelation policy!! We were not informed of any contract changes nor were we notified that the contract changes. It was done without any concent!

Thank you cell c! You will be losing a loyal Cell c customer since 2004!