What is the process to contest a local FAA (FSDO) policy which appears to contradict their guidance? As the title asks, what is the formal process to contest a local FSDO policy which appears to contradict a FAR or FSIMS (8900.1) guidance?

I have already sent an email asking them to reconsider, to which the inspector reviewed the request with his front line manager and said that they were not going to change it (in spite of what I feel is clear guidance to the contrary).  

I then asked for the policy to be reviewed by the local FSDO manager who would be in a position to change it, who also said that the policy would not be changed.

What is the next step?  Elevate it to regional/national?  I remember reading about a formal process where you make a request, and if it gets denied you have 30 days in which to ask for it to be elevated to the next level, but I don't know where I saw that.
If you want to force a policy change, write directly to FAA Chief Councel.  If CC writes an opinion that aligns to your position then the FSDO really can't have their own opinion.  If, however, CC disagrees with you then you're sunk unless you want to take it to court.