Bad services concerning Chronic Cover benefit

I was diagnosed with Glaucoma and submitted to my application for Chronic cover to Discovery Health. The chronic cover was approved on the 9th of July 2020, and I contacted Discovery Health requesting that the claims resulting from the test on the diagnosis must be paid from the Chronic benefits instead of my MSA as indicated in the approval letter. Up to now, no feedback has been received on my request, although the approval letter indicate that the option is available for me to utilise.