Discovery Bank and Vitality travel poor service.

I booked an international flight to London in May 2022 through Discovery Vitality and was given 35% discount. Discovery advised that i have two international flights for the year at that discount. But when I booked the second international flight in August, they only gave me a 10% discount. When I inquired about this, the first consultant said that I had used up both my discounts as the flight to London counter as one flight and the return flight from London counted as the second flight. I did not agree that and called discovery again. The second consultant said the reason why the discount was 10% was because it was within the six week period. I also proved to her that my booking was not in the six week period. Only the third consultant admitted that they incorrectly published the discount. But Discovery refuses to refund me the difference even thought the fault was on their side. I called them several times with no success. This is the worst service that I ever got from a Bank. Beware of discovery bank's false promises.