Still NO refunds

Mtn has still not refunded me for the Wrongful adding of BIS to my childrens phones (Samsung and IPONE) for several months since June 2015. I am tired of phoning them every month and getting the same answer every time. The last complaint that I had here on HELLOPETER they promised that it will be refunded with my next invoice which I received today but shows NO refunds anywhere. Last month they charged me over R2000 for the 4 numbers and this month it is almost R1600. Last months BIS billings have been erased but not refunded. Neither has any of the other previous months been refunded including the Data refund that was promised. In total we are talking of almost R800 according to my calculations and that does not even include the tax that was charged on those items. This is the same story every month. <br> I was also told that my credit limit was raised to R2000 but on the latest statements it reflects as R1639 again. This means that Mtn changes things as they see fit but tell you a different story. I am fedup and angry since I have been struggling with all of this since last year with no positive results.