Check to see if the statute of limitations has expired. You may not even be legally obligated to pay this off. If thats the case, DONT send them anything, as doing so may just renew the limitation period.
Using the donotcall.gov and any other of those websites still dont work. You still get tons of unwanted calls from salespeople and surveys and whatnot. I have my house phone and cell phone both on the list and it doesnt help for either one. If anything it makes it worse.
A very reliable online site like USpopularnames.com will let you experience visiting a dependable web-based community. In case you need verify a call using a reverse lookup directory, this website lets you complete the process. Likewise, you can post your comment and let other people read it.