How do I get google to fix a link which has been pirated?

When I search for currency converter I get XE Conversion. The search results clearly identify the site. However when I click the words to go there it takes me to some sales page for an unrelated product. This seems to be a problem with pirating the existing address as the real website still exists, if you put the address into the url bar.

I just want to find the right area to tell google so they can fix the problem. But after several searches I am coming up blank. Please help.

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