Numerous comlaints wth Keyhealth with no response

I am on the optimun option os the Keyhealth Medical Scheme. I submitted a claim for optical benefits for R6 000+. Numerous enquiries about this claim are nitresponded too. I have a blocked carotid artery which was previously approved under Chronic Disease Management. Suddenly this benefit disappeared because somebody at that division decided that I will not be included under the benefits for heart disease. So obviously Keyhealth refers that I suffer the consiquenses of this chronic disease. Numerous telephone go to voice mail. An complaint lodged to the complaints department went unattended.