Billed Wrongly

Telkom has deducted R1100 for a migration fee on my ********** 380 . The contract had come to an end on the 10th of November 2018 and the Agent(Joyce) at the Telkom direct (The hub, Telkom head office- Centurion) store advised that I transfer the contract to prepaid since I was no renewing the account of which I agreed. To my surprise I was charged R1100 , I called 081180 on Monday the 7th Jan to ask on the matter and the agent (Kamo) agreed that she saw that my contract had ended and didn't understand why I was billed for it. They gave me a ref number ********** 8 , i called today to follow up and they told me they can only look into the matter at the end of the month, the sad part is that they will still bill me for this as i they previously didn't get any funds in my account as i was not prepared or aware of this billing. An extra R200 is added on my account for non payment the same will happen this month. i have head a couple of people complaining about this migration charge that they have also been charged for where they contracts had ended. Just dont understand why the wait if they can see they at fault