Bad service Telkom

Telkom disconnect our lines after we had paid R2900 and we were R100 short. They called after receiving a payment of R2900 and explained to the lady that will pay on the next invoice but still cut our lines. We missed 2days of work we have been using Telkom for 8years but their service is terrible. The billing call centre lady Mandy Ngubane was extremely rude when i tried logging a complaint.