I did not answer. They left a  threating message said I've been warned and they will collect and send a Sheriff to serve me

One Jeff George called asking for someone who hasn't had this phone number in nearly two years. (I didn't know her either).  I respond by by saying that no such person exists with this number.  And the dick tries to correct my English by saying that she does exist (which means he either doesn't understand English or doesn't listen).  I called him back to see where the call was coming from and he was again rude and condescending over the phone. (as was I, I guess.)  So this guy is a douche. Be careful.

This morning apparently the same 'Jeff George' left message saying very urgent to contact, called from blocked number but left this number to call back. Decided to Google it and found this helpful info. Almost exactly 7 years after bankruptcy, we started getting calls from collectors insisting my 'moral obligation' is to take care of these debts they obviously purchased for pennies and hope to scare me into responding to. I've heard its best not to even respond as they can claim you initiated attempt to negotiate, in some states gives the debt a reset on the clock.

Jeff George, very rude , he's calling out of Buffalo Ny, These telemarketers need to get a real job, consisting of mature mannerisms, which this guy definitely doesn't have. On going calls,if you block one they just call again from a different number
with the same area code and prefix

yes, don't listen to these predatory cowards but you may want to contact local law enforcement plus a few complaints to state and federal consumer protection agencies. It's sad that you've been exposed to these cowards.