Telkom Handing over and harassment on Up to Date Account

Telkom has been handing over the up to date account to attorneys. Had to go through numerous effort to ensure these attorneys get proof of payment which telkom has been showing on their monthly invoice. They also hand over to multiple attorneys as a result have to deal with numerous attorneys explaining the same issue worse they seem not to believe you as the account was handed over. I received a call today on an account due on the 30 November and already handed over. This is serious harassment and worse impacts my credit record on incompetence from this company. They even charge late payment interest while payment reflects it was made in time.