Cancellation of Month to month contract

Yesterday, I cancelled my month-to-month home internet contract with MTN. However, I received an SMS stating that the cancellation will not take effect until 01/06/2025. I just contacted the MTN call center, and the representative, Zintle, abruptly ended the call. I am extremely disappointed by MTN's customer service. I have been trying to cancel this contract for six months and all I want is to finally be rid of it.