TELKOM DO NOT COMPLY WITH THEIR CONTRACT

I signed a 2 year contract with Telkom (ADSL smarthome advanced). I did not receive the promised 20Gb per month, unlimited anytime calls and my adsl line is slower than a 2mb line. I have complained to Telkom walk in shop and by email but i only receive a fault reference number and no assistance. Telkom technical department blames the account department and they in turn blames the walk in shop. My contract states \installed within 7 working days or one month free"but they still send me a bill(the contract was signed more than a month ago). Can anyone please give me someone high up in Telkom contact details that can resolve the problem as it seems that the Telkom workers just don't care """