Anyone with advice on how to deal with ex's and split parenting?

HI there,
I have my daughter almost full time and she see’s her Dad every fortnight for 3 nights.
He’s not very nice to me, sends me abusive emails about what an idiot I am etc, I can’t even be bothered re-writing them out. We don’t get on at all. He’s fine to my face at pick up, drop off time though.
I’m a good Mum, I love my daughter to eternity and back.
I hate sharing her, I’ll admit that but she needs her Dad, I can’t change that relationship nor do I want too – I never say mean things about her Dad to her and I never discuss her Dad to anyone if she’s around. However, sadly he does not do this. He won’t let her call me, she’s 4. I will text saying, ‘hey, how is she?’ – his response ’ Leave me alone, I’ll tell you if she’s sick.’ – I have to watch his Instagram feed to see photos of her.
I know it’s only 3 days but I don’t think the other parent should be completely ignored, do you?
If she wants to call him when she’s with me, she can!
She gets my phone and she knows his number – cute, she puts it in and speaks to her Dad whenever she wants.
This behaviour from him is really challenging and I’m wondering If I need to go back to court to get some bloody communication from him!
What are your thoughts?
She starts school next year and I’m not having half and half holidays where I don’t hear from her for a week – that’s just not fair.
Thoughts on how to deal with this or just go to a lawyer?