The work number by equifax is a employee data collection system by one of the most corrupt credit report agencies. Equifax who had a massive data breach a couple years back and released many peoples personal info including ssn recently fired their employees who have multiple jobs by illegally checking their own system randomly without permission to do a background check. Freezing your the work number account will stop them from releasing your employement data when requested. This is not a big deal when doing background checks as you can provide paystubs instead to verify employment.
Just look at what they are doing, they collect our data without permission, use it to make new products against us so the rich keep getting richer, then make it so YOU HAVE to request them not to report it. They will still keep collecting it without your permission.
Out of principle you should freeze your data. Make twn and other similar stuff useless so these companies go out of business.
https://employees.theworknumber.com/employee-data-freeze/
If you call. They request your employer id number which you can google. Just search company name the work number, name, address, ssn, phone number and email on file with your current employer.