Still receiving invoices although service is disconnected

<p>On 28 July I requested my home landline to be disconnected on 31 August 2016. I received an invoice from Telkom for rental until 8 Setember and duly paid this although I was only liable up to 31 August. I have now received another invoice billing for for rental for October. The service has been disconnected but I am still get bills</p>