Billing / Account problem

At the end of October 2015 I sold my house in Vereeniging and moved to Benoni. During this period I cancelled my fixed line service with Telkom but had to pay for a 30 day notice period starting the 1st November 2015. On the 12th December 2015 I received the final bill for this service after settling the account on the 26th November 2015. The final bill showed a Cr amount of R 15.09c. On the 14th January 2016, to my surprise, I received an e-mail notification that my Telkom bill can be viewed and I owe an amount of R 133.91c, I requested my wife to call Telkom and enquire about this mysterious amount and was told that it is for data usage on the above cancelled account? Apparently during the cancellation process Telkom never terminated my data package! Hence I am billed for the data available but have no Telkom fixed line to use it from even after my explicit request to cancel everything! I am not willing to pay for this mistake that Telkom made hence my message to you for assistance. Due to the inefficient Telkom staff at the Vanderbijlpark Branch in Vall Mall, I am left to pay for their mistakes, which I obviously am not willing to do. Kindly assist in this matter, thank you.