For the folks used other employees' GIN# for the survey, Congratulations! Your unemployment benefits will start sooner than you had expected.
The hyperlink in the survey email has your GIN# hard coded in the URL like this
https://gx.gallup.com/engage2excel.gx?ac=XXXXXXX
So as long as you click the link from your email to complete the survey, they know it is you no matter what GIN# you put in. You severely underestimated the intelligence of the IT team in India. Now the management and HR team knows exactly who are screwing around in the company and who should be fired. Genius move to sort out the weed and the money saved from the severance package gotta be more than the fees paid to Gallup.