The reason I suggested a Cease and Desist letter it is a legal action , that I beleive it can be followed by a lawsuit if they break your demand.
The Fair Debt Collection Act --Does not protect the non-debtor

If the collection agency has reason to Believe you know this person or your'e the person in debt.... they have every LEGAL right to call you. The person in debt MUST send a notarized Cease and Desist letter demanding all calls be halted to them, their family, friends, neighbors & etc. The agency only course of action now is to draw suit against the debtor.
If I had the agency address I would start taking the steps that I need too.. I believe I can prove the agency failed to investigate my phone number, I have tape recordings of me screaming at them that I'm not the person I don't know her & to stop calling me! I have reason to believe the 1 st agency went online and place my Dh name with her address to cause undo stress to me & my family. ( I corrected that immediately when I found it!) They have left repeatly messages on my answer machine posing as friends of hers wanting to get together and catch up on old times.....They have used called id spoofing using a local pharmacy number & leaving a message that your prescription is now ready for pick up
From my understanding these collection agencies BUY these debts & try to collect the money. When they FAIL to collect the money.... they than sell the info to another collection agency. The cycle starts all over again..

In my opinion, once I send the Cease and Desist letter they must now update their records& cease all calls from their agency to my number.