[Greenbuilding] EZ Build Problems - SIPs

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Hello,
We are building a SIP home and have had ongoing problems with our SIP supplier.  It has been 6 months since we first submitted our plans and they have still not completed the project.  Design errors and the inability to get them to return phone calls have been an ongoing problem.  Although we are stuck with them, is there some forum in which we can warn others to avoid this company.
Thanks,
Harley