i also don't receive maintenance 
xp has recently started working part time after having spent most of the last 10 or so years on benefits so that he doesn't have to pay me 
i work as much as i possibly can, so that my lovely lovely DS can have the best life i can give him. currently looking for a second job, so will be working 60 hours a week again. the amount of toilets i have cleaned, and backsides i have wiped, and all to provide for my boy. all so that my DS lives in an ok house, has a car on the drive, holidays that he loves and learns so much on, and most importantly understands the need to work and provide for yourself and your family.
if xp was to get off his ever growing arse and work, and pay maintenance, i would not have to consider leaving my DS on his own for a few hours each week to do a second job. DS is old enough for this btw, but it still isn't ideal.
csa are going to pursue a liability order. it's unfair that the onus is on me to find out where he lives, works etc when i don't know where he is and csa have the means to find all this info out.
what also annoys me is that the taxes i pay contribute to the benefits paid to feckless bastards like himself, and also towards the csa itself. ironic!
if i was to refuse to feed, house, clothe and communicate with my child i would rightly be seen as a neglectful parent.