Don't take this bit to heart Mo but THREE YEARS I've been trying to divorce my lying cheating ex.
Every week he does something to 'put me in my place'. Every week.
I no longer talk to him at all. Not one text or email or face to face. He tried to moan at me in front of the children when he bought them home at the weekend. I just said say goodbye to Daddy and walked away. If he had crossed my threshold I would have called the Police.
Anyway, story aside, I understand your frustration. It's endless and I need you to understand, I think you do, it is totally deliberate by him.
Can you get his mother to send emails? Your mother? My mum does it for me. She totally ignores all twat fuckery and returns him quickly to the point. He txt me to say he was late at weekend and I just said please only communicate with Dung's mother. So he had to txt her to say he was late.
It's always money, or a change to contact plans. And I am in such a better place without any communication with him. Do you think you could try this? Or something similar? If a girlfriend did it for you, I can guarantee he won't be such a bully. What about a brother? Got one of those? A cousin?