Telkom is still billing me for an account i closed 5 moths ago!!!

My mother since moved office from Meyerton and cancelled the telkom line on the 4th July 2017. She was requested to send through her business documents in order to do this. She sent all the required documents and was told that the line will be terminated. But til today she is still being billed for a landline she doesnt even use.. Why is Telkom acting like *******?? Why take money that doesnt belong to you!! She has gone to a branch and complained but they keep sending her from pillar to post! what kind of service is this?? When you want our business you are available but when one wants to terminate all of a sudden no one knows who to send the request to !! I demand an explanation and will be awaiting your call . This is nonsense !! you are basically *****ing from her . I demand a reimbur*****t for the last 5 months. This is not right TELKOM you are a big brand . MAN UP!