DISCOVERY MILES SUBRACTED ERROR

VITALITY NR *** I WAS REDEEMING A SPORTSMANWAREHOUSE VOUCHER ON MY APP TO BUY IN STORE AND AFTER CONFIRMING THERE WAS A ERROR NOTIFICATION ON SCREEN AND INSTRUCTIONS TO CANCEL WHICH I DID.....HOWEVER I STILL GOT A SMS THAT 900 DISCOVERY MILE FOR GOODS PURCHASED ........AND THE 900 MIES DID GO OFF ON MY TOTAL BALANCE BUT I DID NOT GET THE REWARD CODE(QWERTY CODE)TO IN FACT PURCHASE ANYTHING AND WAS FORCED TO LEAVE SHOP WITH RED FACE AS THE REWARD WAS NOT RECEIVED AS EXPLAINED ABOVE?THERE IS NO WAY TO RECTIFY THIS ERROR BUT TO CALL DISCOVERY AND AS IT IS NO OPERATING HOURS ON SUNDAY SO I COULD NOT BUY WITH MY REWARD (R100) BUT THE MILES DID GO OFF MY BALANCE...I WANT MY MILES BACK AS THE SMS IS STATING TRANSACTION REFERENCE *** BUT NO ACTUAL CODE TO PURCHACE RECEIVED IN APP JUST AN ERROR MESSAGE LIKE I ALREADY EXPLAINED.