Discovery Card Complaint

I have mostly had great service from Discovery Card / Discovery Miles until recently when I have not been able to get a refund from them on miles that were not released for a purchase on a partner site. I have been struggling with them since October to do so, the consultants do not have any sense of urgency with a distinct attitude of take it or leave it. I was last told that the refund would be done within 7 days with cut off date being the 27 November and yet a further 3 business days later there is still no refund. My only other resource I suppose is to go to the consumer protection board.