Cancelled 30 days before and still being billed!!

On the 20th November 2014 at 11:32 I called Telkom to cancel my landline. The lady who spoke to me informed me that the cancellation would be effective from the 20 December 2014 and provided me with a reference number ***A . End of December I paid my Telkom account as the effective date was 20 December 2014.<br> <br> In January I receive another bill from Telkom, I called the call centre on the 9 February 2015 at 09:45 and was assisted by Sindisiwe who informed me that the cancellation was not done and she will be re-cancelling my line. I informed Sindisiwe that I am not liable for the bill as I followed the necessary process and they need to cancel the account as well as the invoice for January 2015. Sindisiwe informed me that she knows and will transfer me to the cancellation dept. I was kept on hold for 20 minutes before I hung up. I lodged a complaint online and still have not had a response. Reference number obtained on the 9 February 2015 2nd ref ***7<br> <br> Can this query please be resolved ASAP<br>