Not sure which section you are in as you did not mention where you live, and every section has their own rules and protocols.
Having said that, two things:
1) There should be no contracts for 8U(there isn't in my section)
2) My understanding of a release is that you have met your financial obligation to an organization. While this may be frustrating to an organization that you want to leave 2 months after committing as they may have turned away other players for your child, it should not be something that keeps you there. If you have offered to pay the full tuition to the organization you are leaving, there should be no reason to deny you a release.
I would reach out to someone in the administration of your section/district(see link below) and ask for clarification on what the rules on movement are and how it applies to your situation.
USA Hockey Districts & Affiliates