Failure to Give Feddback

After waiting 35 minutes on call waiting for a consultant I spoke to Vuledzana Phalandwa from MTN who explained that I was incorrectly bill and because it was +22:00 the billing department was already closed and he will sent me an email to show that the amount has been corrected. HE explained he can only provide me with feedback on Friday the 10/07/2012 and I wont wont be penalised for late payment. I have sent him emails and he is yet to response and I currently don't know if I have underpaid or over paid. Thanks MTN your customer service is really authentic and deserves an Oscar Award because you sure can act like you care about us.