I didn't receive my entire child tax credit I need assistance.

You must have tax liability for the credit to be applied to.  Once your tax liability is down to $0, you may qualify for the Additional Child Tax Credit.

These links will provide more information:

Child Tax Credit

Additional Child Tax Credit

I didn't receive anything period and wasn't filed I filled out a form and sent it in the mail should I expect additional refund?

Please provide more details.  What for did you send out?  Did you file a tax return by e-file or by mail?  Were you supposed to get the child tax credit?  Do you file a joint return with a spouse or is there another person who could also claim the kids?