I finally got a good letter from the IRS:
We run a small business, and use a payroll provider, who file payroll taxes in our name.
"Dear XXX L.L.C.,
Our records show that you filed an ID10T form. You are required according to statute XYZ to file a PRCKE7 form. Please file the appropriate form or we will burn you at the stake and eat your children".
I call my payroll provider, they take care of it. For the last year, every month, I got the same form. My payroll provider was like "WTF"?
Finally, the IRS got with the program and I got a letter telling me we had filed the correct form.