Cancellation yet to be completed after 7 months ? lets go legal

I am at a loss here , do I need to resort to social media or take the account to our lawyers ?

I submitted forms for cancellation of my clients account (number ********** 73275 and ********** 92 ) on the 13th of March 2018 as he was due to immigrate to the overseas in July. his passport was included in the cancellation and I received an Autoreply that acknowledged that my cancellation had been submitted.

After numerous calls and disputes lodged( ********** 5 and ********** 9 my client was then advised that cancellation needs to be submitted online and that we can recieve a refund after our final bill. Cancellation was therefore submitted online on the 15th of June 2018.

My Client left south Africa on the 1st of July but is still receiving a telkom bill.

Please could I have the email address for your legal department or soembody I can speak to with regards to this as It was confirmed that this was cancelled and therefore his telkom online shows no services yet he is still being billed.

Please could you just advise who I can speak to ? I have proof of cancellation done manually ( via ********** and online)