They have started calling me at my office number. I usually let unfamiliar long distance numbers go to voice mail to avoid annoying vendor conversations, and sometimes do a quick websearch on the number - that's how I found this. Haven't picked up and won't!
I have just started receiving these calls too, which I let go to voicemail. I finally Googled the phone number and came up with this site, fortunately. I used to have a subscription to the free publication Biotechniques; Steve SLC noted his call was with regard to this magazine. It is very good, if you are in the biotech industry. However, I'm going to let my subscription lapse because I don't appreciate such shady tactics. I may try to see if they have my account info online and, if so, change my phone number to theirs.