Financial mediation

Ex Husband has referred our financial discussions to mediation because I am disputing his financial claims.
I have proven discrepancies on formE and he falsely claiming to be contributing to house bills and mortgage. I can prove he doesn’t.
Because I stated that I reject his last offer based on the discrepancies he claiming to be paid and said I stand by my previous offer he has said he wants an unfair split of 50:50 with ridiculous terms and is bullying me with threat of mediation.
can financial mediation work? There is no compromise. His wants are getting less fair with each financial lie I prove.

Mediation shouldn't been seen as as "threat" but as a next step in attempting to negotiate a financial settlement. A mediator will work with you both to facilitate constructive discussion, and provide a neutral platform for you both.

Before you have your first joint session, you will both individually attend a MIAM which is a Mediation Information and Assessment Meeting. At this first meeting, the mediator will explain to you how mediation works, and what you can expect to achieve from joint sessions. You will also be assessed as to your suitability for joint sessions; you will also have the opportunity to ask any questions you may have about the mediation process.

Mediation will only work if both parties are committed to joint sessions and are prepared to listen, discuss and compromise. Even if you think he won't compromise, it is worth attending as the mediator can sign your Form A so you can apply for financial remedy through the court.

I use the word threat due to nearly 20 years of coercive control and emotional abuse.
the solicitor worded the letter to state that the referral to a mediator has been made already and even added that they only did this as it is a prerequisite to taking me to court