Under Australian Communications and Media Authority (ACMA) regulations, all Australian carriers are required to partake in the Local Number Portability (LNP) scheme. In the event that a 3rd party carrier is preventing you from porting your number(s) to Neural, they may be in breach of these regulations.
The resources below provide some information on the subject to assist in educating such carriers of their obligations...
A summary on the ACMA website:
This is a fantastic guide published by the ACMA as a starting point to dealing with such issues.
The Telecommunications Numbering Plan (1997):
This is the legislation surrounding the process and obligations.
Direct Legislation Extract:
This is an extract of the legislative section governing number portability and carrier requirements.