Discovery not paying for COVID 19 test

Can somebody please explain to me why a covid test is not covered ? I called in before i went for the test as well because i know Discovery will try to find a way to NOT PAY for it and clearly i was right. The lady told me what needed to be done in order for the claim to be processed and i was assured that a covid test will be covered. I did everything as required and now you telling me that "i dont have a medical savings plan" i think i would know that based on the fact that i signed us up and it states ESSENTIAL DELTA CORE and not SAVINGS.

Please look into this as this is not acceptable.