Vitality doesn’t pay cash backs

I was promised cash back on the flights I booked in June for September if I meet my weekly goals, of which I did. But now Vitality doesn’t want to pay me my cash back which has been due beginning of November. I was told I would get it on the 26th of November because that’s when they pay out and now we on the 3rd week, when I call them I’m always told it was paid that day but nothing comes to my account. I have sent inquiries but nothing has came out of them. They don’t miss debiting my account every month and increasing premiums but when they have to pay out it’s a struggle. This is not the only bad experience I have had with them when it comes to cash back. Last month I was told that I must link my pick n pay rewards card on their site to earn healthy items point and I did the day I went to buy groceries but on the day that I receive points my points were not there and when I inquired I was told to e-mail the till slip, who keeps the food till slip for a month. These are the tricks they come up with so that you will give up from claiming what’s due to you. And besides we are paying ourselves because what little we get vitality premium is way more than that.