Getting bills for a "cancelled" account two months later!!!

I cancelled my account in December 2017, with the cancellation set for the end of January 2018. I received an email confirming the cancellation and received my last bill in February for January. I have received another bill for February, I do not live at the property and moved out in January, cancelling this account has been impossible and I have had constant billing issues! I have begged, pleaded...I do not know what more to do now! Getting the Telkom account is easy, getting the correct billing and cancelling is impossible!