The approach used over here to locate you was unfair or I would say, illegal. The Rep should not have kept his identity and purpose hidden while trying to locate you.
Next time, when you get a call from this person, start recording it and if it is not permissible in your state, inform the person about the call being recorded. You will have legal proof of this illegal contact.
It might be that the collector is trying to collect a debt from you which you owe. In such case, you should place a call to him and inquire about the purpose. Do place this call from any payphone outside. Do not use your home phone for this purpose. Know the reason of the contact and ask them to validate it if they are seeking collection.
Do not give any of your personal info until you are sure that it is for a legitimate collection. If he asks for your info, tell him that he has used unfair means to contact you and you are reluctant to update your contact address.
Do read this article to know why it is important for you to contact them.
http://www.debtconsolidationcare.com...ollection.html
Please let me know your take on this
Regards
Roxette