contract cancellation

I have been trying to cancel my expired contract for almost a month now. and still the contract continues. I am no longer willing to call the cancellation department every 5 days only to be told the cancellation has been escalated. the final amount owed has been stated in an email sent to me. that will be paid and any further use of data i will not pay because i now consider it free since the contract was meant to be cancelled. thank you MTN for my free data!!! ref number ***. I would suggest that if you don't want me to use this free data u cancel my contract today!!!!!