1) Complain to the brokerage of the listing agent in question. In this particular case, that would be Daher Companies out of Methuen.
2) Since this is a REALTOR brokerage, they have committed to abide by the rules of the National Association of Realtors ... so you could also contact the local REALTOR chapter (which I believe is the Greater Boston Real Estate Board) http://www.gbreb.com/
3) You can also contact the Real Estate Licensing Board at Ann.Barry@state.ma.us or find them at http://www.mass.gov/ocabr/licensee/dpl-boards/re/about-the-b reporting the specific property and real estate agent in question.
For what its worth, the property just closed on November 10th at less than 1/2 original list price. I noticed that your post was in July ... perhaps you had brought your complaints somewhere and it resulted in an adjustment?