Discovery not honest

I have not been this angry in a long time. We joined Discovery and the Vitality programme presenting all these benefits we can enjoy. We made it clear from day one that one of the main benefits we will use is the flight booster. We concluded a contract with Discovery based on the information we received then and that was that the flight booster will be a benefit. We then have to wait for 3 months before we can enjoy that benefit. No problem to us we will then just book after 3 months. By chance I logged into Vitality today and see that flight booster is coming to an end today and guess what our 3 months have not come to an end which means we cannot enjoy this benefit. How is this fair really? We joined on the premise that this was a benefit and please do not tell me that Discovery decided on a whim to cancel this benefit this was in the pipeline way before we joined SO WHY WAS THIS POSSIBILITY NOT CONVEYED TO US WHEN WE JOINED. This is out right contract breach. I insist that the date for ending this programme be moved until our 3 month period comes to an end so that we can enjoy this benefit as PROMISED by Discovery when a contract was signed. Also where are the notices to members, I have gone through my emails and I knew nothing about this benefit coming to an end. If I did not log in today I would never have known. Please let me know by close of business today as I will take this further with my contract which was concluded with Discovery and everything that was concluded.