Lcw review of a late decision..

Hello, last year I suffered an incident from which I still haven't recovered and need further surgeries. Me and my wife receive UC. Not long after the incident took place , I filed a form for PIP. UC approved the sick notes for 3 months, and then informed me that I have to go for an assessment in a month. Due to the heat last year, they cancelled the assessment and arranged a telephone meeting a month following that. I then received a letter , saying the assessment was LCW, I didn't know what that meant and I didn't appeal their decision. September I got a call from PiP, and a month later I received a letter saying they rejected me. After MR I sent the documents I had to the tribunal, and during this time , universal credit were tiring me out by looking for a job for me. March after a dispute I got sent for a new assessment and I received LCWRA incredibly quickly . A month ago the court awarded me with PIP with backdate from last year. The question is the following ; can I appeal the first assessment from UC for LCW, because on the phone they said something and it the end it turned out different . In other words, can I get them to give me LCWRA from the date that the PIP is from. I still don't get money for LCWRA, it's been 3 months and I'm waiting for the next month. In UC journal , we have pointless chats like in a dating group, waiting for answers for several days
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i know PIP doesn't automatically give  LCWRA ...but they left me without any help for 16 months.. 

Thank you