No feedback given after numerous calls

On the 21/03/2015 telephoned call centre to upgrade, on the 27/03/2015 telephoned again to down grade, was told New scheduler so I cannot only on my billing date which is 15/04/2015,I told consultant Clou that I was not informed about New rules,so she said she would retrieve call ,listen and call me back.This was at 11:05 am.Telephoned again later in the day and advised by another consultant that Clou would get back to me.On the 13/04/2015 got customer service number and spoke to ,Pearl,explained everything.She got back to me the same afternoon after listening to call retriever and said not my fault,down graded and said I will only be billed for R158.60 plus my compact amount of R319.00 all agreed.On the 15/04/2015 was billed for a total of R627.34 Telephoned on 16/04/2015 spoke to Lehlohonolo who typed everything again and said she will sent Pearl an email to rectify on the 17/04/2015 still no feedback spoke to Charles and then spoke to his supervisor Palesa who promised to look into it and get back to before 8pm because she was working the late shift.STILL NO RESPONSE !!