MTN Contract

I called MTN on the 7th of March requesting cancellation of my contract. Did The REF is ***. They send told me " termination date as per contract signed is 22 April 2025" I am still receiving monthly statements from MTN. My contract is paid in full and my MTN number doesn't even work anymore which is correct. Why is MTN still sending me statements this is unacceptable tried calling them and they don't answer. Surely they have this on their systems. I will not pay MTN for this issue. This has to be resolved ASAP