Its a student loan consolidation company. If you call them and listen to the options, you can post your number on their "do not call" list. I believe its option 3. They will ask you for your full name and phone number - then end the call by pressing # sign.
213-232-2315 has been calling me as well. The caller ID says "HECA" that is a bit different than what is posted already so beware of spam and scams from this number