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There is what is known as a "sliding burden of proof" which means you first show the proof you have of what he has paid and then it is up to him to try to prove he paid more. You need to file a motion for an order to show cause
for contempt of court and should have had your attorney filing these every time he did not pay what he was supposed to pay to establish he is willfully refusing to abide by the court order and the court can award you attorney's fees on your contempt motions.
You can show any bank records you have that reflect any payments you received from him. You have to put your records together the best you can to show what he actually owes you in arrears. If you cannot come up with any records at all from 2007-2011, then this could be a problem, but you can seek proof through discovery to make him provide proof of his payments to help your case and your attorney will seek to have the court order him to produce those records.
Also, you need to ask the court for garnishment for future support in your motion.
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