Discovery Insure have no idea what they are doing

The issue started when I joined DiscoveryInsure over a year ago and I NEVER received the fuel rewards card. I sent numerous emails on this and I was told about a delay in the delivery of all loyalty cards due to the Postal Services protest action. So I used the card number that was sent to me and about 75% of the BP's could NOT process my transactions manually. Despite not receiving the card and going through hassles and the frustrations for about a year, I went and got a new one from Tiger Wheel and tyre and I tried to link the New Card. But their website did not update it. The staff at discovery insure are so difficult that I even had to show them my browser history that I went to the Discovery Website to the link Cards section. Eventually they wanted me to send them slips for over a year that I used the number manually, and I was never told that their fuel rewards system doesn't work and that I should keep my slips. They said it is my responsibility to keep them. I told them I never knew that I should keep them and it was never communicated to me and I would like some benefit and if they could process it from my bank. Now again they want 1yr full bank statements.