Cannot get rid of them

We sold out house in November 2017 and notified Telkom about this in October 2017. Between me and my mother we have visited the Telkom customer care center 6 times now , spending about 8 hours in queues and trying to get confirmation that the line is deactivated. It is now 3 months later and we still get bills from Telkom for the line that should have been deactivated at the end of November. Whoever is responsible for accounts and operations at Telkom should be fired. They are hopeless. Standing in the queue it is the same story customer after customer... This is a disgrace - do the people that sit in the fancy offices realize how pathetic Telkom really is? Based on the amount of frustrated customers I have encountered it really looks like Telkom does not give a damn.