Discovery miles

I took A Discovery Credit card last year March and wen i got it i had to pay R350 for a year to activate my discovery miles Benefit. As of Feb 2016 i had decided to cancel my card as i was paying far to much, for far too little. When i sent in my closure letter i was informed that that account would be closed within 3-5 working days . so i went onto take a lot to spend the miles that i had obtained over the last 11 months. When i checked out it was waiting for the payment from my miles. I contacted a Gentleman by the name of Keenan Bennett. An extremely friendly and helpful guy. He had told me that he spoke to managers and there is nothing they can do about it. I did this very unfair as i made the purchase on the 8th and had only received a closure letter on the 9th... I paid for a full years service and i want my purchase that i placed to be paid with my miles that i had earned. I paid for that service so i am entitled to the rewards. I want my issue to be resolved as soon as possible as i am very unhappy with this service i am getting from Discovery card . I have been part of discovery for the past 4 years and have a few policies with them.