What to do when I-485 is beyond normal processing time

#1
We have done the finger print Jan.2015 at category of EB-1 to TSC, and status has been finger prints received and three month ago, then it updated to the extended review. We contacted the senator and was told TSC is doing name check. Now another three months passed since we contacted senator , what else can we do to get updated information from TSC. It is way beyond the normal processing time for EB-1 case, what can we do to get updated information and speed up the case processing.

Thank you.
 
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