Re: Child support
The FRTC site, http://www.deltabravo.net/custody has a lot of resources, including a Child Support Spreadsheet at http://www.deltabravo.net/custody/cs-audit.htm You may be able to use that with your records to clear this up some. There is also a newer version of this in the back of the Parenting Time Tracker at http://www.deltabravo.net/custody/tracker.htm
This is not an uncommon problem. You may have to take support enforcement in NY to court to get it cleared up. If you or any relatives live in NY, you could try contacting your state representative or other politicians who can apply pressure to get it cleared up.