TELKOM STILL BILLING ME DESPITE PAYMENT OF PENALTY

I payed the agreed penalty fee to Telkom for the cancellation of my TELKOM LTE agreement. Their is a trackable reference number and I have communicated twice to the cancellations department. However I have been debited twice and keep receiving monthly bills. I have blocked debit orders and reversed them and sent follow up communication, however they keep taking money off my account. This is absolutely ridiculous. There is no follow through from their side at all on these types of issues.