Payment for no show

My mother booked an air ticket using her voyager miles. My travel plans changed and I called in to postpone the booking to a new date. On the 27 of August 2015, I called the customer service as I had not gotten confirmation for travel as I was to depart from Johannesburg on the 28th. When my mother called to get the ticket sent to me, she was told that the dates and everything else had been re-confirmed but there was a no show fee of R500 that has to be paid as I had promised to call back to confirm the new date. The funny thing is that they already had the new date of travel so what is the no show about? Could the airline be trying to recoup its losses through innocent unsuspecting client.<br> <br> Sooo mad!!!!!