******** amounts added to a pricelock Payment Plan

Since March 2017 we are on a Price Lock R949 / m payment plan. On 6 Aug they added R541.93 to my account and again on 6 Sept they added R412.90 and again on 4 Oct they added R346.66. I phoned more than 20 times. Case no. ********** . They can't put me through to the right department to speak to a competent person, handling the Price lock plan billing. I can only speak to random consultants that always says the same thing " we will escalate your matter" I'm fed up phoning. Where does this extra charges come from? DSTV owe me R1301.49. When I phoned on Thursday they said I owe them R1028. HOW IS IT POSSIBLE!!!?