Some help me

So I went to Curaleaf.. got prescribed medication

Due to my past they want to check with my doctor if prescription is ok…. Won’t continue without doctors letter

Been to doctors and told them it helps my autism and adhd and the doctors reply was it goes against our ethical morals, and forwarded me onto a mental health charity instead

Curaleaf won’t help me without this letter!

Any one got any ways round this?