Who called from 8135690729

Who is calling from 813-569-0729?

i get calls from this number several times a day, and they never leave a message.  who is this?

So far I've received two calls from this number, one on 2/16 and again on 2/20. No talk, no message.

I called this number back and it said that it was the kramer (sp?) group, and they were contacting me for a survey.

I receive numerous calls from this number.  No message left.  Answering machine always says "If you would like to make a call, please hang up... When I called the number back I hear the mailbox you are calling is full and not accepting new messages.  Very annoying!  Placing on Do Not Call list after this post.