Incorrect billing since September

I contacted the MTN direct upgrades in September and spoke to Lulicia who assisted with the upgrade(***). I initially asked for a Top up 200 with the A5 Samsung phone but the next day i called Lulicia ( after 7 calls made to the call centre ) i found someone in some department that was kind enough to send her an email . She called me and i advised her i would like the Top up 50 with the blackberry 9720 instead . She confirmed she h captured the Top up 50 and assured me billing will be correct . We received the blackberry after three weeks but still I am being billed for the Top up 200 . I called and called Lucia advised me she is taking care of it and is busy with her manager with my query and that she will contact me back . It is NOVEMBER and is till haven't received a call from her or anyone for that matter . I requested a manager and got no response . I complaint via Facebook and still no response . DOES ANYONE IN YOUR COMPANY CARE FOR GOOD CUSTOMER SERVICE? . Apparently my order for the top up 50 is pendingsince September .is it still pending ? seriously ? i was billed less last month then this month ... WHAT!!! get my billing correct and credit me