I too had an ad placed on craigslist and they also called and they were pushy and rude.

8/15/2011.. Got a call today
Caller asked if the price of the RV was such and such and they would put a sample ad in their web page. Wanted to know my last name, etc. Asked him how much is their fee and he would keep going back to the free sample ad pitch. I asked him if all my information would be in the free ad and he said no, it is just a sample. To get rid of him, I told him I would check out the web site first and call him back in a couple of days.
In the past, I have been contacted by the same phone number and after telling the caller, that I had a interested party, I would get a hang up..

I ALSO PLACED AN AD ON GRAIGSLIST TO SELL MY HOME  AND THEY CALLED AND TOLD ME THEY CAN  PUT A FREE SAMPLE AD  ON THE MULTI LISTING   THEY WAN TO MUCH INFORMATION AND AFTER I TALKED  TO THIS TONY I DISIDED I DID NOT WANT ANYTHING TO DO WITH THEM

I too recived a cal from 720-242-6862, he spoke with an accent,  we were selling our camper on craigslist.

I HAVE RECEIVED NUMEROUS PHONE CALLS FROM THIS COMPANY. THEY HAVE CALLED FROM DIFFERENT AREA CODES YET THEY ALL ARE BASED OUT OF DENVER COLORADO. THEY HAVE ALL KINDS OF TRICKS TO TRY TO GET YOU TO LIST WITH THEM. I WOULD TELL EVERYONE THAT I KNOW NOT TO WASTE THEIR MONEY WITH THIS FRAUDULENT,DISHONEST,UNREPUTABLE COMPANY. CALL CUSTOMERS ON THE WEBSITE AND ASK THEIR OPINION OF THIS COMPANY AND THE SERVICES THAT HEY PROVIDE.