They are in breach of contract and Employment Rights Act 1996 by not paying you
They are in breach of Data Protection Act / GDPR by not using the details you supplied / making changes without your consent.
I would be taking more formal action, and requesting a written account of what happened from their side, make a written account of what happened from your side.
I spoke to my union yesterday, i know what formal actions need to be taken. Thing is, my boss is very helpful so I want to give her till end of this week to see if we can’t sort of her way. She is not one of those lying ones and she is very sorry. So for her. I am holding off formal actions.
They are in breach of contract and Employment Rights Act 1996 by not paying you
They are in breach of Data Protection Act / GDPR by not using the details you supplied / making changes without your consent.
I would be taking more formal action, and requesting a written account of what happened from their side, make a written account of what happened from your side.
See if ACAS have any advice https://www.acas.org.uk/