UC reviews as an advocate with health issues

I've tried to challenge the review via telephone using reasonable adjustments as im also disabled but my sons advocate.
I understand that it needs to be completed and I'm happy to comply but I asked for a paper review .
This has been ignored firstly, then granted and again, and again refused in a week by a team leader.
Ive been told I need to do this via telephone .
The dwp don't seem to be recognising there own policies to not disadvantage is and make reasonable adjustments.

I get muddled in telephone calls because of meds forget things get angry , anxious, can't think straight because its emotional .I do not want to mess up his claim its life essential for us.Any advice please .

I had a home visit a year ago to do a renewed appointee .

A year ago his identity was verified
Ive had to send a photo recently which I thought was awful
I had to send 3 months bank statements also fully .