Telkom Over Charges!!!!

I am honestly fumed with Telkom. Nothing they do is right!!

I app**** for a 4mpb Wifi installation in June which cost around R650. I upgraded ( due to the internet being slow) to 10mpb speed which is R809p/m. They gave me another router of which I took back to the Telkom store ( I didn't even get my LIT box that comes with my contract) The invoice came as R1800 of which I called them and told them I returned the extra router that they charged me for. I then asked why my debit order date is at the end of the month and I was told they system changed it from the 15th to month end... What dust is that??!! I didn't pay for that incorrect bill and yesterday I received an invoice for a whole R3 700!!! What ****ery is this??????!!!!!!!! Telkom is seriously the worst network currently existing!!! The WORST!