You may be able to get the assistance of the IRS Taxpayer Advocate Service at toll free (877) 777-4778.
These are IRS employees who work to resolve problems taxpayers are experiencing.
Please ask the Taxpayer Advocate representative to find out why your W-7 was rejected.
The Taxpayer Advocate Service has offices in every state. You can look up offices in your state at:
https://www.irs.gov/advocate/local-taxpayer-advocate
