You'll learn "debt collectors" will use a skiptracing company or "internal staff" to go after all possible leads to sucker someone into paying a debt they don't owe. At first they'll kindly ask for info then they'll call twice daily. Since you're not the debtor a simple letter from a lawyer of C&D usually works, if they begin to flood your voicemail you're able to nail 'em for harassment. They use more than just LexusNexus, Experian, etc.
When a debt collection company uses skiptracing they'll use pretexting(fake they're the dead person to the telco) and gain access to phone records that aren't public info and then pull the same on relatives to nag co-workers/friends/family.
Several years back when an aunt died a debt collector firm contacted my wireless telco for a copy of my phone bill and customer service called my phone number to confirm it was who I was(I think Verizon Wireless & T-Mobile do this to cover their ass for privacy reasons). If I recall my telco sued a few companies over pretexting but it still happens.
Sadly since Bud Hibbs died I can't reference the exact "shady" stuff some agencies will attempt--Buffalo based ones are the worst as they'll tread as closely to the grey area of the law.
....also keep those voicemails as a record of the first contact, enclose a copy of that on an audio CDR with a C&D letter from a lawyer. If you get called again multiple times, have a lawyer go all pitbull on 'em and a judge can slap damages on them
