Cancellation not processed and still being billed

I cancelled my telkom telephone line on the 30th of November 2017. i cancelled due to the fact that I was forced to move and the new are I live in does not have phone lines. So I moved over to one of your LTE products. Yesterday I received a mail with a new invoice. So I proceeded to contact telkom. I was assisted by a lady and was advised that I send her my cancellation email. Which I did. with no feedback. Then this morning I phoned again. Spoke to a new consultant. And was again advised to send her the email I sent for my cancellation. I have done this again. And yet again I have received no feedback.

Can someone please advise as I am not willing to pay any additional charges. I submitted my cancellation and paid my account at the end of December.

Thanks you.