Who called from 2135197298

They called again about 24 hours ago; Again, I don't know who it is

This number called me today. Left noes sage.

Received call today..loud noise no one spoke

I have received two calls from this number but they did not leave a message I call the number   they are a market research firm they are not on the federal Do Not Call list because they are not a telemarketer they are calling to inquire about your experience with some product or something like that they will call you again

This # Calls 3 - 4 x's a week, when I let the answering system do it's thing they leave a very loud irritating noise & no message.  This is leaves the caller physiologically immature.