Billed for a cancelled account

I cancelled my account with Telkom at the end of June since I moved to a new house. My new house mate requested an adsl line at our new place to be activated at the start of July in his name.<br> <br> I did not receive any bills for June, July or August, but suddenly I am getting bills for September and October. After receiving the bill for September I already let them know that they're doing something wrong, but I was still sent another bill for October.<br> <br> The line at our new place (on my friend's name) has still not been activated. We're now in the middle of October (almost 4 months later).<br> <br> I will not pay for a deactivated line at a house that I'm not living in. You will clear that account.<br> I expect to have internet at my new place before the end of October. This should have been done at the start of July already.<br>