MTN NOT CANCELLING MY EXPIRED CONTRACTSE

Countless times been phoning MTN to cancel contracts that expired!! Got the cancellation code after one of their staff members told us that we will loose our numbers if we cancel a contract after it ended??!! ***?? O and if i cancel my contract i am going to loose all my airtime an data that i payed for!! MTN ARE CRIMANILS!! ******* But still 3months later they still keep billing us month to month!! I call this *****ing my money!! MTN records all calls so will see who will win this battle of who owes who money!! So now i am asking on HELLOPETER CANCEL MY EXPIRED CONTRACTS!!!