"Sean" (with an accent, and it ain't Irish) claimed to be from UPS.  He called three times, looking for employees regarding package deliveries, so I decided to trap him by requesting and researching the tracking numbers.  When I advised that none were valid, he hung up.

UPDATE -- Has called a total of seven (7) times today from a variety of places.  Must ask him to spell and repeat everything, because of heavy accent.  What a waste of time!  Finally had it and slammed the receiver down.  Will see what happens.

I am getting the exact same thing at my place of work. It used to happen a couple times a week, and now the past two days I've gotten probably 15-20 calls. Most of them from this number- 9419235822. But then the last one was from 5628036682. They keep asking for employees at Life Technologies which has nothing to do with our company. I started keeping a list yesterday after talking with someone at Life Technologies.

10/26
9419235822- asked for Sonia Vera at Life Technologies, said he was calling from UPS
9419235822- asked for Al Ng at Life Technologies, said he was calling from UPS
9419235822- asked for Prosanna Thwar at Life Technologies, said he was calling from United Health Care
9419235822- asked for Fiona Cochrane at Life Technologies, said he was calling from Maxwell Enterprises
10/27
9419235822- asked for Francisco Chavev at Life Technologies- said he was Dr. James from Cardinal Health
5628036682- asked for Jason Ellis at Life Technologies- said he was from Tomarco

Had the same guy call multiple times from the numbers: 562-803-6682 & #941-923-5822. He kept calling for the same person and stating that he was from FedEx trying to reach "Ken". I sent him to shipping since any information that he would need would come from our shipping department. He then called back and was angry and rude on the phone. I proceeded to block his call and that's when he started calling from the 562 number. He began yelling at me so I hung up and he called back 3 more times from the 562 number then tried 2 more times from the 941 number.
These people are absolutely ridiculous!!!