Not allowing month to month contract cancellation

I have been trying since 2 January to cancel a month to month data contract got reference nr ***9 after visiting the store but end of Jan got debited again. Phoned call center 31 Jan got new ref *** and got another statement saying they are going to deduct again Feb and March because I need to give 30 days notice. How is from 2 Jan to 30 April 30 days. Last I checked that is 120 days. seems like I will have to take away my private and business accounts away from Telkom for bad service