I know this forum is fun to read and fun to post to, but take more action. Otherwise the TU executives reading this page - and I promise they do - will continue to sweeten their morning coffee with your tears. You have to make it hurt, financially.
Neustar does marketing and advertising effectiveness campaigns for a number of large companies: AT&T, Verizon, T-Mobile, Comcast, Facebook, Google, Amazon, Microsoft, Walmart, Wells Fargo. Don't click any adds you see from any of those.
Freeze your credit reports at TransUnion. If you live in California use the CCPA's right to be forgotten law to have TU delete your information, so they can no longer make money from it.
Do reviews on Glassdoor (both .com and do co.in), Indeed, Comparably, Blind and other sites with your feelings on what kind of place this is to work. A quick search for employer review sites will find many.
If you know of or suspect integrity issues, conflicts of interest, or other ethical concerns at TransUnion, report them. Also consider reporting them to TransUnion's major customers. If you search for terms like "ethics hotline" along with a customer name, like JPMC or Goldman-Sachs or Bank of America, you can usually find an online form. Many use secure.Ethicspoint.com. Suggest they look into it.
Contact regulators with concerns: the Reserve Bank of India has a form, the PCAOB has a tips and referrals page, the CFPB has a whistleblower page, there is similar information available for GDPR.
Protect yourself during these activities by using a personal VPN, the TOR Browser Bundle, a Protonmail account, or all of the above.
You must hurt reputation and revenue if you want to make a difference. Few companies will voluntarily do the right thing, and certainly not this one.