CANCELATION ISSUE

I have canceled a MONTH-TO-MONTH data contract with telkom on the 9th of March and I was told that the debit order that went through on the 5th of March was the last debit order I would have made. (TelkomSA: Dear Customer, Fault Reference ***9 has been closed. Please do not reply to this SMS)

Next thing on the 5th of April, I see bank charges from a bounced debit order. Telkom tried to debit my account. I called Telkom to ask what was happening and I was told that I owed one more payment to them after cancelation. I was told that I was misinformed by the lady who canceled my contract. At this moment, I had made more than 5 calls to Telkom and they all told me different stories. One guy said I owed TWO months' payment. Finally I spoke to a lady that advised me to pay the last amount instead of waiting to get debited the following month because I might get blocked and what not. She sent me Telkom's banking details and a reference number. I did the payment on the 12th of April.

Today! I decided to call Telkom to check if the money I paid reflected on their side. The lady I spoke to told me that the money is reflecting BUT I must expect to be billed next month for a bounced debit order. First of all, I spoke to more than 5 people from Telkom. How come none of them warned me to expect to get charged for the bounced debit order that I didn't expect after canceling my contract? I would've unwillingly paid it WITH that last payment I made to Telkom and get it over and done with, but now I feel like Telkom is finding reasons to keep taking from my bank account. I really don't understand how Telkom people are trained because they NEVER say the same thing. Every new person I talk to tells me something different.