UC queries

Hi
my husband ha MS and dystonic tremors. He was signed off work sick last April 2017. They never once rang or visited him to see how he was or what they could do to help him. He submitted his sick note with the wrong date put is UC date in instead. The company sacked him because of this with no phone to say can you get another one. 
They said that he was in breach of his contract and was awol. 
He went to Acas not very good as they are impartial. So he is going to a tribunal for unfair dismissal. He applied for PIP but was 2 points short of getting standard PIP. CAB advised him to reapply a new one which he did this time got zero even though he feels worse. The assessor was awful hurried us and I was trying to explain things but she told us we need to get on as she was running out of time. The report was like it was about someone else not my husband. She said that he was able to walk to the room even though she was in front of us and he was linking my arm. The other thing was due to his tremors he cant chop or prepare or use pots and pans but she put he can use the microwave to make a simple meal. He has worked the past 30 years or more full time even though he had MS. But the past couple of years he has become worse. The problems he has is dexterity and balance.
We have had so much problems with UC but are now in receipt of reduced payments due to my part time wage. He submitted his sick note which is for 3 months but has been asked to go back in for an interview. I am now very worried that they are going to turn round now and say he is fit for work.

Thank you