I'll try & keep a very long story short.
My XP and I split up soon after I became pregnant. He said at the time that he would support the baby (DD) financially but didn't want to be part of our lives. As you can imagine I was a little miffed by this so when he quickly found a new woman to move in with and decided he was no longer willing to pay maintenance for a baby he didn't want, I decided to go to the CSA.
Since that time, almost 11 years has passed and I feel like I've spent more money on phone calls than I've received in maintenance. XP hops from job to job moving or going on benifits as soon as the CSA have organised assessments and set up deduction from earnings. I just feel like I may as well give up!
XP gets in contact very occasionally and tells me none of it is his fault, it's the CSA being useless. Then tries to tell DD how much he loves her!! 
I wonder if this is worth carrying on with, We haven't received any maintenance in years and when we did it was only for a couple of months until he could move jobs again and restart the whole process. I don't think he's ever going to have a relationship with DD, doesn't even send a Xmas card. I've just had enough now.