One 31-year-old Norfolk mother told BBC News she had "given up" trying to secure money from the father of her 12-year-old daughter via the Child Support Agency because it is not working.
One mother said she expects to see no payments
She says she must work 33 hours a week to support her child.
We split up when my daughter was two-and-a-half. We were not married but lived together.
After we left him there was very little contact.
Six to seven years ago I contacted the CSA. He was ordered to pay £5 a week - which really is no use to anyone.
He was employed, but as he had mortgage commitments he said he didn't have to pay.
Three to four years ago I contacted the CSA again. Last time I spoke to them was about a year ago.
They just say 'There's such a backlog that everything is being processed'.
Living in his big house, with new car and motor bike, taking several holidays - it is quite obvious to me that he has the money to support his child, but chooses not to.
The CSA needs to do more, much more. I was asked to prove to them that he was working.
I felt they should have chased him and found out where he was working and what he was doing.
You feel like you're just left and there's nothing you can do.
'Hold him responsible'
I just haven't tried again. People just aren't getting anywhere so I just gave up. I would be on the phone trying to get through...
I feel let down. It makes me sick, to be honest.
It takes two people to make the baby and two to bring it up. There are so many fathers out there who are not providing but should.
Things should be followed up and not left. I expect I probably won't see anything out of him.
There's a big feeling of 'this isn't fair'.
I have to struggle to provide for her, she always comes first. He should be held responsible for his actions.