You might try Xtandi support https://www.xtandi.com/financial-support
Sometimes you get lost in the shuffle, and sometimes insurance appeals or other requests get sent to the wrong place. It isn't that much fun but you should kick up some dust. Call your oncologist's office every morning, until you get a response. If there is a patient portal use that in addition. Sometimes a fax will get a response when nothing else will.
The offices can flounder with these appeals and the challenges to denials can be time consuming, but you should be informed of exactly what the delay for and status of your prescription.