Why do ACH files get sent out sometimes even when the account has been frozen and the transaction is still in pending status?

If the file has been sent to the network we are not able to then revoke it - in this case a return has to be issued. If the account is frozen prior to the file being sent out, then the transaction can be canceled, but if after, it would have to be handled as a return.If the file has been sent to the network we are not able to then revoke it - in this case a return has to be issued. If the account is frozen prior to the file being sent out, then the transaction can be canceled, but if after, it would have to be handled as a return.