OVER CHARGED AND HORRIBLE SERVICE FROM THEIR AGENT

I have a device (Samsung Galaxy S6 Edge) with Telkom on contract SmartPlan 100. I took insurance with Telkom for this device and the contract for the insurance clearly states that it is R151. But instead i am now being charged for 2 devices THAT I DO NOT KNOW .I called the call center for clarification on why am i being charged R494.4 for an insurance that is suppose to be R151 and the consultant i spoke to also did not understand why i was charged this amount i did not agree to, he promised to follow up and advised any charges occurred will be reversed and this will be fixed before the end of the month for my next invoice but that was not done instead i received another invoice advising me that i owe R 1,023.45. which will be deducted on the 31st March 2016 and indeed it was deducted. Again i called the call center demanding answers and spoke to Letlagd1 *** and the service i got from her was BEYOND APPALLING she didn't care what i had to say and i asked to speak to the manager and was on hold for 30min, she came back saying the manager is busy he will get back to me in 24hrs and still waiting. NO ONE IS TAKING RESPONSIBILITY OR WILLING TO ASSIST ME WITH THIS. F*****!!