Billing/bad service from call centre

I was billed an amount on the 1st of feb and I did not receive an invoice for this amount.i called the call centre and the call centre agent did not understand my query and did not assist in any way accept waste my time.all I want is for telkom Mobile to break down the amount for me that I was debited for on the 1st of feb.the lady at the billing department says she cannot tell me what the amount was made up of as the bill hasn't generated on their side yet which makes no sense.how can u debit me an amount and not have an invoice breaking down that amount.according to her my invoice will be ready between the 5th of feb and the 7th of feb for the amount that was debited on the 1st of feb.i asked to speak to a manager and the manager was to busy to take my call and he also did not want to call me back.so I said to the lady I'll hold on the line until he was available to take my call.after 20 mins the line got cut and that was the end of that.guys your service is pathetic and ur staff need more training .someone who knows what's going on needs to call me and sought this billing issue out.i need answers!