Telkom is the worst!!!

This is the worst service provider EVER. I have a mobile contract with Telkom for 4 years now. My upgrade was due on the 6th of August. Till up to date no one phoned me. I tried the call centre, spoke to agents, telling me they can't help me I need to phone 10213 to up grade. Once I key in my number, the automatic operator tells me I am not due for an upgrade and cuts the line! Then after calling the agent again, they don't understand that I can't upgrade. Now I want to cancel my contract, I need to do it online, the system tells me they can't process my request at this moment. Each time I want to cancel online, they are unable to process my request. I do not know what to do! I don't want this contract anymore!!!!