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I have recently discovered that one of my clients has either been sabotaged or has done this himself.  In the case that he didn't do anything, how do you go about getting rid of bad links? There is now over a 1000 bad links linked to his site, do I report them as spam or what is the best way to fix this?

In Webmaster Tools I discovered that a client of mine with signed up for or hired another company to get links.  The links are poor quality and from other countries, so it looks like a link farm was done.  I want to know when they links were linked to the site, and not sure how to find that information out.  Does anyone know how to find this out?