Not much you can do legally unless you get a company name and preferably an address or web site, something. If you feel that your SS# has been compromised, go here and fill out the proper form (probably 14039):
http://www.irs.gov/Individuals/How-Do-You-Rep ... aud-Activity%3F
Also file a fraud alert with the 3 major credit bureaus.
Call blockers might help, and for the cell phones there are free call blocking apps that work very well.