Billing of account

I would like to log a complaint on my dissatisfaction with Telkom, I called on the 17/08 and purchased a data bundle for 10g @ R149 as advised by the agent that assisted me. To my surprise today I received my bill and it cost me R1007 total bill of R1800. What madness is this. All agents I speak to confirms same amount. I need my account to be rectify ASAP I am not paying this ridiculous amount of money. MY case no log for investigation ***0