Telkom still billing after cancelation confirmation

I have canceled my contract with telkom. However I am still getting billed even though I got a confirmation email my month to month lte has been canceled. I now sit with a bill of 3 months. I was told by advisor to wait for final bill however im still being billed. Im annoyed as I have received a lawyers letter for an outstanding bill. I will be going to the ombudsman as I have proof of cancelation in an email