They just keep on taking you back and forth

Joining discovery can be such a pain it's fascinating and pointless. They keep sending you back and forth with things I don't even understand. Now am told I must pay for another x-ray and medical report. Again after I have seen the doctor and he filled the form they asked to be signed. They asking for a diagnosis I keep telling them and they keeping asking me the same thing. They just decline the application so I can go else where this is a waste of time