I have two kids (six and seven) and me and my ex have a private agreement for child support of $100 per week. However I haven't been working since May 28th 2014. I don't get to see the kids and she hardly let's me talk to them on the phone. She has had 4 children to other people since having my two, none of which she gets child support for. Between November 2013, and May 2014, I made over 40 000 and I'm worried I'm going to have to pay back pay. What are my rights here?