Unfair treatment by Discovery Vitality

I'm very disappointed at the way Discovery is handling my issue of apple watch benefit. I activated the watch benefit after I've had my credit card with Discovery for some times and the conditions of the watch was that if I don't meet the goal for that month they will deduct some money from my credit card of which I didn't have problem with. So after sometime I got emails from the lawyers demanding that I have to pay R9000 for the watch because Discovery couldn't get money from my credit card since it is not linked to vitality, I was shocked because my card has been active since I had it and always had money. Since the lawyers threatening to blacklist me I paid the R9000 and I called vitality about the issue and they told me my card was delinked from vitality but they don't know why, and they promised to investigate the matter but after I paid , I kept calling and they were just giving me reference numbers and promising to get back to me , until today I have paid for the watch in full and no one is taking responsibility of really what happened. I'm so disappointed.