After you file

I filed electronically and my return was rejected someone else claimed my dependent  my daughter who lived with me all last year , and so as my selfish ex is spending it all up im barley able to survive not exactly sure why they let anybody claiming dependent without school records anyway that should be part of the tax form itself before you can claim and get the money for him cuz I can't get ahold of anybody either any suggestions would be great i need money bad