Correcting Corrupted Google Data

Correct Title and Snippet but incorrect URL

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I recently had a company contact me regarding a very strange result within Google’s SERPs. Their site maintains their same high position within the ranks, the Title is accurate and the snippet is pulling the DMOZ description correctly. However, the listed URL is to a completely different site (completely unrelated and unaffiliated). In addition, if you click on the Title link it takes you to this ‘foreign’ site. Thus all of their traffic (Google) has completely halted.

This phenomenon occurred between March 29 and April 4th. The site has been spidered multiple times since then and the corrupted data is still in the index (e.g. the cached page is referencing the wrong site too).

Further investigation has revealed that the ‘foreign’ site is a site that does reside on the same server (shared IP).

The URL for their site resolves correctly (i.e. if you enter the URL directly you are indeed taken to the correct page). AOL, Yahoo and other indices are all correct. So it looks like the problem is truly corrupted data within Google.

How can this happen?

More importantly, how can one fix the corrupted data within Google’s index?

I appreciate any insight anyone can offer.