Line Cancellation

On 3 October 2017 I requested that Telkom cancels my phone line (with ADSL) on 10 November 2017. The cancellation was done as requested, but during the whole cancellation period of 38 days (Telkom requires 30 days) no a single consultant made contact with me, whether it be via phone or email, nothing. On 5 November 2017 Telkom issued my next bill on which I get charged in advance for line rental and ADSL from 4 November to 3 December 2017. When I phoned the call center today to ask if Telkom will be crediting me for the period 11 November to 3 December, I was told it doesn't work like that. WHY was this not communicated during cancellation? I would have left my line active until 3 December to make calls at least. UNACCEPTABLE!