One thing to check is whether Equifax is being truthful about advising consumers whether their data was compromised, or is just using this as an opportunity to enrol them in a service that Equifax wants to bill for in the future. Some tried random SSN digits and names, and was told that all of them had been compromised by the hack, so please complete the Equifax Credit Monitoring enrolment signup process. Or it could just be that they don't know how big the problem is, but they are trying to look like they do.

https://techcrunch.com/2017/09/08/psa-no-matter-what-you-write-equifax-may-tell-you-youve-been-impacted-by-the-hack/?ncid=rss