Incorrect Billing

For more than six months Telkom has been charging us reconnection fees when the bill has been paid. We have a fixed unlimited calls and unlimited wifi and our bill should be R1400 per month. Every month Telkom charges us more than R2000. When we query then they reconnect. We have tried calling Telkom and even went into the Bayside store to resolve but still not resolved. Over and above this my Mum is a pensioner and she is not receiving a discount. I am now wanting to cancel this account