Telkom Milking the Customer

I cancelled my telkom line of the 21st november 2017. telkom policy require a 30 day notice period. that would make it the 21st December 2017. i called telkom after the 21st december. i was told line has been cancelled. i had to pay for the dec to jan 18 invoice which i did. if you call my land line number it says number does not exist, which means it should be cancelled. i asked about my refund, they said the will send email stating all cancelled and then refund me. i then recieved another statement from telkom, asking me to pay yet another months line rental. i called telkom yesterday 15.01.2018, i was told line isnt cancelled. this is total bull****. Telkom is milking the people. from 30 day notice period, its now almost 60 days. i want this sorted, i will not be paying the jan-feb invoice as i cancelled in november. im not a dairy for you people to milk. sort this out asap please