It's a kinda interesting conundrum. Obviously Simonds have a complaint against CHM Constructions but if their lawyers have advised them to do this, then I think they need better lawyers.
Blocking access to the site from Australia probably won't make a whole lot of difference, because the real reputational damage might arise elsewhere. Simonds need to get the site shut down or amended.
The most obvious way to do this would be to file a DMCA complaint. "But wait," you say ,"neither party is in the US!" True - but chmconstructions.com is hosted in the US, and all the major search engines are *also* hosted in the US, do they *do* have to comply with a DMCA complaint. In my opinion, there is sufficient copied material on the Indian site to justify a DMCA complaint. And you don't even need to get lawyered up for that.
The other way to do it is to hire a law firm in INDIA and threaten legal action over there. Indian lawyers are not expensive, but in my personal experience in a similar case.. they are of highly variable quality. Probably better than the Ozzie lawyers Simonds hired though. But if you actually want to *do* something about the problem, then India is the place to go.