Need to rant. Basically my EX was useless with paying for DS when we split and also refused to have him at all towards the end because 'when would he go out'.
I moved to the UK with the agreement payments would be used for visiting and that birthdays and christmas he would give me money for DS. This lasted a year and money was used towards a present and also things he needed (coat/shoes etc). Money stopped after a while.
He paid for 1 visit 6 months after we returned (March 2007). I have tried to get money as he hasn't paid what he said he would but to no avail. October this year he agreed to start paying a small but regular amount. He didn't pay it and this month (last week) he paid me half of the agreed amount and rang up all pleased with himself.
UUUURRRRRRRRRRRGGGGGGGGGGGG 
I basically cannot afford to live and think he is taking the piss. Thanks for listening to my rant.