Got the same call in TN. Here's what 411.com says about the number.
(240) 210-7113
Type: Cell Phone
Provider: New Cingular Wireless Pcs, Llc
Location: Waldorf, MD
Desperate bottom-feeding losers, unemployable in any other field, who buy up old debt (often past the statute of limitations) and break consumer laws trying to coerce people into paying.
The best thing is to ignore them, or if you are determined to answer when they call (advice: don't) make sure that you tell them at the start that you are recording the call. They'll go nuts and hang up on you.
Do you know Richard Fields? NO! Do you know where I can find him? I HAVE HAD THIS NUMBER FOR OVER TWO YEARS..........IT DOES NOT BELONG TO RICHARD FIELDS. TAKE ME OFF YOUR CALL LIST.
These guys are using 240-210-7110, 7111, 7112, 7113, 7114. They do the same thing on all lines. There is no help from the government on this, so block them from your phone company or add them to contacts and send them directly to voicemail.