Inaccurate technical equipment

I travelled on Monday 9 Feb 2015 from Thibault Square station to Atlantis via MyCiti.I top up at Racecourse station @ 17:48:38(receipt No ***)with 80 points.(R80)When I reach my distination,I tap out as normal,but until my surprise the validator display insufficient funts.I try 3 times but with no success.I show the driver my receipt.I called the call centre immediately,approximately 18:45 to report the incident.(Ref ***)According to Aqueelah Safiedien,\According to our records the customer failed to tap out on the 9 February 2015.The onus is on the customer to make sure they tap in and out correctly. Therefore