UC Assessment recorded

hi, I had a PIP review phone assessment November 2021, daily rate stayed the same and I was awarded standard mobility, I requested a Mandatory Recon as I believe I should have had and increase to enhanced Daily, I had the assessors report which was nothing like my assessment. I received a letter from PIP December 2021 advising it could take up to 12 weeks for a decision. In January of this year I had a Universal Credit health assessment via telephone, now I`m unable to hold my phone because of the pain due to having nerve damage and Carpel TS in both hands my phone automatically goes onto loud speaker I always advise the caller of this. my son was visiting at the time of the call but he went outside while I had the assessment, on his return he told me he had left his I pad on and had recorded the whole assessment. I received UC decision a week later and had decided I had LCW, I disagreed with this decision, I requested an explanation which I received a week later. I was shocked, I estimate that 99 per cent of information from the assessor is untrue I could not believe that this "Health Professional" had blatantly lied, so I listened to my sons recoding.
Gets a little complicated next, 3 days after my UC assessment 2 days before I knew the outcome of UC Assessment I received PIP MR decision letter and decided my PIP will stay the same using the information from UC assessment quoting extracts from UC Assessment. When i received UC decision I requested an MR from UC and I have appealed PIP decision. I am wondering what exactly I can do with the recording, am I able to use it as evidence, would it be accepted as evidence? \in my mind I think the assessor should be disciplined, how are they able to get away with all these lies, its so very wrong I am still in shock!!