They call me everyday from different numbers.  They never leave a message. I know they are all the same company since whenever I call each one back, it goes to a mailbox that is full.  Sometimes I say "hello" and they immediately hang up. I have tried different tactics to get them to speak and tell me where the heck they are calling from, I have : curse/yell, speak sweetly, and have a male to answer.  today I just picked up and listened, a lady came on from something called resorts something about a time share.  I said no thank you and she hung up. I'm sure they will call back from a whole different number tomorrow, I think I will try a British accent.
Here are all the number they have called me from, I'm not lying when i say every day.
8013492417
6173373208
3146675628
3018803413
7187151333
9012550633
4783774008
8175912221
7579414687
5412571321
7273886733
6306213244
3172076816
8653660463
2678409002

Not a bill collector.  They are trying to get you to go to a timeshare in Vegas.  Offered free trip and cruise just for visiting.  For a cost of $189.  When I asked what the catch was they got very offended.  The "gentleman" started losing his temper and using bad language because I said no and I wanted more information about the company.

It is likely a bill collector.  When I call it back it allows me to leave a voice mail but identifys itself as the Corporate Office.  Benn greeting these things for a while using different numbers and area codes. Pricks call on weekends and late nights when they think your are home.  Does it matter since they call my cell phone?

The person has called a few times in the past week asking "Is Mitzi there?"

9:16 AM on 4/17, no message.  ID says Transport, F

calls once a week no mess.

Called 2x today. Does not leave a message.

Obnoxiously asking for someone, then hañg up...or, just hang up!!  3-4 times a day