how to call USCIS to speed up I-140 process

EB2, July filer,TSC RD /July 26,2007. Notice date /Sep.20,2007 , 140 still pending, any ways I can get its process speed up by calling them ? Also I changed job at Feb. 2008, my previous company told me they are not telling USCIS that I switch company,but the previous company is shrinking ,possibly closing. Is my 140 in dangerous situation? Thanks a lot for any info.