MTN *****ing money even after having a cancellation contract

My contract ended with MTN in June - wasnt notified that i still had to cancel (airtime subscription on that contract) I cancelled the airtime for the sim that same month but the following month i still got deducted on that amount I called in and waited a hour, once someone assisted the cold dead lady told me they have to process why it got deducted and ill hear from them in 3 to 5 working days via sms MTN you are totally ridiculous and i WONT be using your service EVER again

Please anyone reading this DONT fall for their trap