Cancelled Landline via email and still get billed

I cancelled my Telkom land line on 19/11/2015 via email where I emailed the cancellation form as well as ID. Telkom even emailed me acknowledgement of receipt of your cancellation request.<br> <br> What do you know, I get billed again for Janauary.<br> <br> After trying to contact the billing department, I was referred to the cancellation department which is only available via email.<br> <br> Oi, don't no where to go to next? Extremely disapointed in the service.