You are legally entitled to review for an IEP under the IPRC process. All that is required to initiate the IPRC process is a written request by the parent(s) to the principal requesting IPRC, which entails evaluation for exceptionalities and ensuing drafting of an IEP. The principal is bound by educational statutes to comply with the parental request.
If you have submitted a written IPRC request and have been stonewalled, I recommend sending them the source documents enclosed in the link below and voicing an intent to make a complaint to the district head of special education if the statutes aren't honoured. (I can provide a name and contact information in a PM.) This is not something that can be legally refused.
http://www.edu.gov.on.ca/eng/policyfunding/leadership/pdfs/issue12.pdf
