Unfulfilled promises and complete neglect

On the 29th of May i got an sms saying that if i rent a movie that weekend i will get a guaranteed R100 pizza voucher. Ive been calling talking to every consultant in your offices but till to day no one and i mean none have come back to me with an answer to say yes we will fulfill our promise to you as you did rent a movie that weekend or no, they don't see this as a promise to keep. Its been three weeks now and im very disappointed about the complete neglect of customer care, I don't care much for the voucher but the display of complete dishonesty and promises not kept is what gets me angry. i really hate your customer service that you teach to your staff, i dont blame them i blame you for not teaching and training them.