BLUEBEAN LIES ABOUT THERE 10%BACK SPENT IN DEC

I AM VERY UPSET AS TO THE AMOUNT OF LIES BLUE BEAN MASTER CARD STAFF HAVE TOLD ME. IN DECEMBER I RECEIVED AN SMS FROM BLUEBEAN STATING THAT BLUEBEAN GUARANTEES YOU 10% BACK ON ALL PURCHASES UP TO R5000. CAPPED TO A PURCHASE VALUE OF R5000 ON WHICH A CASHBACK OF R500 WILL BE RECEIVED. VALID 1ST DECEMBER TO 16 JANUARY 2016. WHEN I CALLED THE CALL CENTER TO ASK THEM WHY I HAVENT BEEN CREDITED THE R500 AS I SPENT R6000 DURING THIS PERIOD THEY SAID THE LUCKY DRAW HAD ALREADY HAPPENED AND THE WINNERS WAS SELECTED ALREADY. WHAT ******** IS THIS. IT WAS GUARANTEED A 10% BACK AND I WANT MY 10% BACK WITH NO EXCUSES BLUEBEAN. I STILL HAVE THE SMS IF YOU WANT IT.