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Well, you can't really do much about it because you don't know who stands behind these actions. If you discover that a lot of Chinese (.cn) or Russian (.ru) domains are suddenly linking to your website, it might be a good indicator of low-quality backlinks.
@arainbadami per page you will need at least 50 QUALITATIVE backlinks. An exception is the home page where you need at least 100, again qualitative backlinks. Bear in mind you need excellent content and authoritative forums.
It much depends on the quality of the backlinks. If the web pages ranking above you have way more backlinks, then this could be part of the reason you're not showing up in Google. To see the number of unique websites (referring domains) linking to your page, paste your URL into Site Explorer or our free backlink checker.