Useless Accounts, billing after account was stoped

I ended my account with Telkom as i was moving to another area, so i did not want to have my telkom line moved aswell. I went to the Telkom branch and canceled it, so they tell me it takes a month to cancel the line and the wifi service i have, what i think is fair.. I paid my last settlement and the following moth they send me a invoice of R2,00 That was paid as well thinking oky the service was cancelled, dont need to worry about telkom anymore because i no longer need to pay them. so the following month comes and they send me a invoice of the full amount again!!! i phoned them asking whats the hell is going on why another invoice?? So the call center person tells me no they made a mistake the only cancelled my line and not the service!! i dont know what they think i will be able to do with the service if i dont even have a line?? It ridiculous that these people cant think for them self.. Then she tells me i dont need to worry they will stop the debit order, and the dispute will be sorted out for me. So of course the debit went off from my account i phoned them atleast 8 more time after that and every time they promised me it will be resolved no later Than the 14 Nov..