Abusive x - using CSA as a weapon to NOT see kids

My x left nearly 2 years ago (to live with his girlfriend a (ex) friend of mine) and we have been divorced for nearly a year

Last March I applied to the CSA for maintenance becasue we were never going to be able to come to an agreed settlement.

So over time the CSA bill has been increasing ...

he was self employed and managed his income down to such a point that maintenance is set at £5 per week. He hasn't paid a penny towards the children nor towards the house. And has also gone bankrupt so that all joint debt becomes mine...

Well now I get the following:

I have just had a large bill from CSA. If you still insist on me paying maintenance I will not be in a position to see the children! I have less than £50 a month spare so if you insist on me paying that will go down to less than £30 not enough to buy a round at McDonalds. Please explain to A I can't see her next week as I need to pay the £200 CSA bill instead.

So i replied:
I appreciate your financial situation but this is your problem to solve not mine.
It is your choice whether you see your children not mine.
I am unaware of what you have said to A - this is your conversation to have not mine.

(on the last point I know he had arranged with me to have A for 1 day - this would be the first since 2007!! but I hadn't told her as I didn't expect him t do it. I am now aware he rang her once in January and told her then)

And the response I now get is:

Piss of!!!!!
You now have T living with you and obviously helping with family fincances. How the hell can £20 a month help you you bitch!

What woud you answer ... would you ignore him, tell him this is his responsibility not my new partners, tell him that £20 makes a difference as on a weekly basis I am dealing with creditors ...

Still it has shown me once and for all that he is weak and abusive and probably always was!

I'd ignore it.

It doesn't cost money to see children. They don't have to go to McDonalds everytime.

He is just being offensive.

I'd just write saying that you wish to keep the CSA settlement separate to the discussion of on-going parenting and his visits.

Tell him 'A' would like to visit; albeit she'll bring a packed lunch.

I can't get my head arouind the Kash-4-Kids excuses I read here.

He sounds like he's using the CSA claim to excuse him from seeing the child. Pathetic.

Thanks have decided to ignore him ... and no I won't spend time tonight tossing and turning and asking the why question!!