[Residential Cold Calling] Do lead services work

I have been running a telemarketing sales floor in the b2b world for 3 years now, we are working on a new project that would involve consumers and residential, Dex pages seems to be a bit of a joke in 2019. I see alot of services promising updated lists im wondering how many people are getting the same phone number and how accurate are there updates.

If anyone has any insight on a lead source other than dex or a service providing them that has done them well please let me know

stick to b2b....... b2c isn't worth it