Discovery's client service is atrocious

Discovery messed up my hospital authorisation. Two days after I was discharged they retracted the authorisation I eventually got them to fix it but now they are sending me claim assessments stating that my bills can't be paid because my MSA is empty - because they depleted it with the claims, which should have been paid from hospitalisation. When I send the claim assessment that they sent to me back to them to reprocess, they say the claim is illegible. I have thought about leaving Discovery and joining another medical aid with better service for a long time now and this incompetence may just be the last straw.