Once you hit 105 days since they received your app, try everything here:
http://www.ilrc.org/sites/default/fi...yed-201608.pdf

USCIS won't help, you may want to skip those steps, but contacting ombudsman and your congress person seems to be your best bet.
I regret not sending my renewal earlier. I didn't know they were accepting them 180 days before expiration. I thought it was between 120-150 days.
I then regret not contacting my congress person sooner. I heard from them a couple days before I expired and they are trying to help me. They said they helped others but they didn't know how long it would take.

I did bio-metrics in August and am still waiting.