Hello, My Name Is Peter And I Have Been Using

Hello, my name is Peter and i have been using amantadine manufactured by you for several years with good effect. I recently tried banner pharm s brand and was shaking like crazy. i went back to you guys but since i had a 3 month supply of banners my insurance company would not pay for it. Yours works and i was wondering if you could help me with my insurance company to tell them why sandoz pills work and banners do not.