unfair billing system

am so disappointed actually disgusted at Bonita's medical aid. i have been with this medical scheme from 2018 and i recently changed my cover .all my claims where rejected and am being told i didn't do the wellness assessment, I have been doing this assessments for years now . so now i have to pay from my pocket . am being told i cannot re-submit the claim. why are we being ****** like this .with everything that is going on in this economy nows my medical aid is giving me hell .i want to cancel this with immediate effect cause what kind of service is this