Husband is lost and upset.... advice needed

I read your message and it brought tears to my eyes, the thing that hurts most is that the ex doesn't think any of this is wrong and justifies it in her mind, C has tried contacting Dad 3 times unfortunatly he missed the calls but when we tried ringing back the phone rang out then the next time it was switched off.
we have spoke to the social services and she advised us to go back to court.
we are going to do the paperwork tonight and it will be more detailed than last time and hopefully the judge will read it this time.
my husband has been on the edge for weeks C has missed her party with her brother and seeing all her family from london.
we also have pictures and stories that C has done with all of us on saying how much she loves us and worringly one picture she did on the last weekend, 5 sep, we were together saying please don't forget me.
the ex just tries to make us feel that C dosn't want us and we have to be strong and remeber C is 10 and will get manipulated and at the end of the day she is Daughter and Step-Daughter and we will do anything for her.