Finally put in a claim after nearly 4 years a apart. Ex is on very low pay and I don't really need it, but want to make the point that he has responsibilities as he contributes nothing at all. I would like to save the money for the dc, as I can't afford to save much at the moment.
Weekly payment were due to start in MArch but I received nothing but an abusive email telling me I was 'nailing him to the ground,' and am a 'bitch' etc etc. I told them I want to swap to collect and pay, which would cost me 5% and him 20% of the amount he has to pay. I received a letter from them today telling me we can't go to collect and pay because 'Mr Twat hasn't told us he wants to'!!! Wft - how is that a reason? I have tried to ring them to clarify but was in a never-ending queue so will try again tomorrow. But, really, he 'hasn't said he wants to.'!? Of course he hasn't, because he doesn't want to pay anything at all. Ever. I can't believe I am £20 out of pocket to be told this.
He has them 2 nights a week but buys them fuck all - I've just spent a fortune on a residential each for them, new sports equipment for one of them, new summer wardrobe for the eldest, birthday party for one (he got him nothing) etc etc. But he doesn't want to contribute anything so he doesn't need to. They have to take underwear to his to change into and ds1 has just asked me to pack him pjs to go there as ex still has the ones he took there nearly two years ago 
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I'm lucky in that I can afford to support the dc without his help (though it stings that I'm saving for his future financial settlement instead of their futures and can't afford to do both atm) but some women are struggling and dealing with this shit shower of an organisation. What can be done?