Contract is for R599 but they bill for R699

In September I app**** for the telkom unlimited broadband deal in my area and received the deal at R599. They deducted the full R599 from my account 23 September, the payment for September should be pro-rata from the day the router, SIM and antenna was delivered, which was 30 September. 1 October they issued an invoice saying they have not received any payments and that they will be deducting R699.28 end of October, I called the call center and was reassured that the statement was incorrect, and will be corrected as soon as the money shows in their account. Today to entire R699.28 was deducted. so not only did I pay R599 for ONE day (pro-rata) service in September, I am now paying R699.28 where I was only supposed to pay R119.50 as the call center agent assured me. So Monday the next invoice will be made out, this payment will not reflect yet and I will once again pay the full amount because they use external collectors that causes the money to show only AFTER they make out the next months invoice.. Now I have to wait until Monday to call and be put on hold for 55 minutes like every time.. Thanks telkom..