Ex and I have 3 DC. We do not get on. He pays me £14 a week per child and has them 3 nights a week. He owes me over £1000 in backdated maintenance.
On Friday he told me that instead of dropping dc at his house at 10am on sunday it would now have to be the evening as it was 'ridiculous' him getting up at 7am to get home in the to have them (his gf lives a few hours drive away).
I said it's his only day off the week to spend time with them and that it wasn't fair on me or the dc to simply announce the change. He proceeded to tell me he 'doesn't give a fuck' about me and that 'it's like talking to a retard' .... 
I said if he was going to expect me to have the DC all day Sunday then I would also have them Sunday night and he could collect them from school as usual on the Monday. Rather than him simply having them for bedtime and paying less maintenance (again).
I contacted the child maintenance service to inform them of the change and he has lied through his teeth saying he is having them for an extra night during the week. This is not true and was never even mentioned, let alone agreed to.
I cannot believe he is lying through his teeth to yet again get out of paying for his children. I've just had a baby and feeling low as it is and it's like he's trying to push me over the edge on purpose. I cannot bear the way he speaks to me 