Discovery keeps changing the rules

When in your Self Payment Gap, Discovery has a thing called Day-to-day extender benefit, which pays for GP consultations under certain conditions. Every year the rules change, and are never communicated. So after you go to the GP, thinking you've followed all the rules, you get slapped with the bill, and Discovery is not interested because you didn't follow the "new" rules which no one knows about. Them after finding out the new rules, and following them, your account still not paid. Then you are told something new which you were not told last time. And this goes on and on and on .... Every time you ask a question, you get a different answer. I'm not going to renew my membership at Discovery next year, I'm looking for another medical aid that does not make up rules as it suits them. Also, every year the premiums go up, and the benefits come down.