Pip

Hi. I was on low care and high mobility for three years.
My review was October and I got letter today
I did my assessment over the phone.
When I got assessors report I complained. My mum was in hospice at the time and my head was all over.
Anyway the deciding officer agreed with the assessor.
I got low care. Lost mobility
My mobility has got worse. I have arthritis in my knee and carpel tunnel nerve pains and tarsal tunnel.
They said I am no anxiolytic meds and I am on three
They said they wrote to my dr but dr said he lost form so I called pip to send another they said they were making a decision without it.
Any ideas on mandatory ?