I agree that you certainly are going to need some proper legal help on this but it may be possible to analyse your story and to distil it to the relevant aspects. what you've written here is very heavy on narrative and I think that is part of the reason why it is difficult for people to understand exactly what the situation is.
I'm not saying that I can give you the answers but I will have a think about it it and and if I can get the time, I'll try and put a few points down tomorrow but don't hold your breath as to any dazzling insights!
Don't touch them owe me £500 since January 2019 make excuse after excuse. Seem they always have software problems sending money out. Keep saying they will call back or email nothing been chasing it now for 6 mths the phone staff always have the same banter we will chase it up and get back to you then nothing!