Child support in Florida received payments from my husband on 2/28/2011 but issued an order to have our accounts frozen. They $500. More than what was owed out of the account.

Your first step is to contact the Agency that withdrew the money, furnishing PROOF it was paid in full and an excess amount was taken from the account.

If that doesn't work you MAY have to go to Court - but I'd try the first step first.