To File complaints FDCPA/TCPA violations:
Your State Attorney General
Their State Attorney general
www.naag.org (you can find your state AG at this link).
https://www.ftccomplaintassistant.gov/#&panel1-1
http://www.consumerfinance.gov/complaint/
http://www.rcfp.org/reporters-recording-guide/state-state-guide
http://www.dmlp.org/legal-guide/recording-phone-calls-and-conversations
Also with the BBB and follow completely through with it.
http://www.consumer.ftc.gov/blog/haunted-phantom-debt
Seek a FDCPA/TCPA Attorney if need be.
***A company must be licensed in their state as well as the one they are trying to collect in if two different states are involved.

Some Tips:
*Keep all messages
*Take a picture of your Caller ID
*Keep any and all conversations recorded to your states recording laws, some require they be told, others do not. This can be transferred to a recording device.
*Keep a notebook handy for writing time,date, who you spoke with and what the conversation detailed.
*Check your SOL for your state as well.
*Attorneys need to be licensed as a DC to collect, all DC's must be licensed in their state as well as yours if different.
http://www.insideedition.com/investigative/93 ... debt-collectors

Follow the steps in what you need to know here:

http://800notes.com/arts/Jb8EW-eDhQA/harassin ... ou-need-to-know
See Residents post here also:
http://800notes.com/forum/ta-34af6a034ba34b6/unending-collection-calls
Templates of Letters:
http://800notes.com/Phone.aspx/1-319-242-7350

http://www.ftc.gov/os/statutes/fdcpajump.shtm
http://www.consumerfinance.gov/askcfpb/search ...
http://www.consumer.ftc.gov/articles/pdf-0096-fair-credit-reporting-act.pdf
http://www.consumer.ftc.gov/articles/0149-debt-collection