Wanted to switch over to discovery, because I was not on medical aid from 2018 to 2023 they are adding an additional 25% to my membership

Wanted to switch over to discovery, because I was not on medical aid from 2018 to 2023 they are adding an additional 25% to my membership. I am not sick, no conditions, rarely go to a doctor. I will for sure not join discovery health. I hope that this model makes them go out of business one day. My current medical aid did not penalize me at all for those 5 years. Quote me R9000 a month and gives me R11 000 savings PER YEAR. What is this company smoking?