Metropolitan Life doesn't want to re-asses a mistake made by them

In 2015 I submitted a disability claim to Metropolitan Life. At the time, I was employed by SARS and was forced to resign due to my medical condition, which rendered me permanently disabled. My claim was declined on the basis that I have resigned and haven't been boarded. My claim was not for occupational disability, but rather a permanent disability unrelated to my specific work environment. I reviewed the policy documents and found no mention of such a distinction that would disqualify my claim based on it being labelled as occupational disability . From 2015 to 2022, my health deteriated and I was in such a bad state, that I just gave up. In 2022, I received advice that my claim should be reassessed, as it was incorrectly declined based on a misinterpretation of the nature of my disability. I therefore requested via endless emails and phone calls that Metropolitan Life re-evaluate my claim based on the original intent — a permanent disability claim, not an occupational one. I've been trying to find answers since 2023, no one answers me!