incorrect billing

I have complained since I had acquired my contract. I am being charged incorrectly for my contract. At first Vodacom acknowledged that they were wrong, and refunded for 3 months. They stopped thereafter. They resumed charging me incorrectly. I am a pensioner and this is causing me unnecessary stress. If this is not sorted out by end October, my daughter will be taking legal action. I have made several trips to Edgars Pavilion and my efforts have been in vain. Contact nos are ***, ***.