Refund Being Denied

My sister in port elizabeth had cancelled her telkom line in july 2017 due to cable theft and telkom having responded that they will not be replacing the cables my sister requested that her line be cancelled and her R700.00 deposit refunded. To this day she is still waiting for the refund to materialize. Having spoken to customer support agent after customer support agent and being told she would be refunded the refund has yet to be made. Telkom are quick to demand payment but when it comes to refunds they suddenly lose all intelligence on how to do so.