It's so ridiculous. The least you deserve is an answer. I think what they want to know is that you've tried other, less expensive options first, so if you haven't, you may not get approved. I've been going through something similar but the prescriptions are for a condition that causes me severe chronic pain on a daily basis. Every day the insurance company delays is a day I am miserable. It seems like they hold up every single prescription I get. It sucks.
On another note, I found Retin-A to be more effective than Differin, and great for wrinkles too! But good luck getting approved for that
