Being denied to cancel a contract that matured

I am very disgusted with MTN , I think they are busy training their cancellations department to deny us with cancelling our contracts. I am going through all social media to hear people having the same issue with cancelling. After trying to put notice in Nov 2025, they told me to call dec I called twice in dec 2025 and was given reference for notice. After the Dec debit order went off I Phoned to confirm if its cancelled only to be told no there is no request, I am not sure why are you forcing people to continue with service they do not require.