Telkom Escelation does not exist

I am appalled at Telkom service. I followed protocol, filled in cancellation form and gave a months notice as I was advised by Telkom Agent who sold me the LTE router. This was done 28 Feb 2018. I paid my last bill end of March 2018. I have waisted multiple phone calls to understand why i am still being billed for this. Every call involves the call centre person saying "i will escalate this". Who are earth is responsible for sorting out the escalated issues as this just seems to go into a cloud of none return and yet another bill i get. Sad thing is i left Vodacom for Telkom and i am ever so sorry for this move. My last ref is ref ********** 1 Name Tevin.