bad payes

I have been a loyal customer to momentum for a long time so have been my colleagues at work.My baby girl was born on November 2014,Bills to momentum has always been paid on time.I now get letter of demand from the babies pediatrician for an amount that has not been settled. Reason this was not paid was due to authorization.HOW WAS THIS NOT AUTHORIZED.As far as I know with the first baby all of this was PRE-authorized by the gyne.I Had not been available at that time cause I had been at work.Momentum needs to make sure all of this is done when members register for maternity program.why did medical aid not advise on this payment. I am now left with this outstanding bill.<br> PLEASE Settle OUT THE FOLLOWING BILL<br> <br> DR JONATHAN EGNER<br> PRAC.NO : ***