Ex and I separated at the beginning of the year.
I've only just contacted the csa as he dropped the money giving me and I don't trust him to declare earnings.
Thing is, he's told the CSA he has them 3 nights a week. This is untrue. He has them one and his parents have them sometimes.
He says that if he chooses to foist them on his folks that's still him having them and no different from me sending them to school. 
Because he paid a solicitor to write down the days he WANTED them (although he has no intention of seeing them) the csa say they believe that over my word. Although its bollocks.
What do I do!?