I get a call from this number as well, some women asking for someone and would not leave a message. And when I would try to call all I get is hello, no business greeting nothing something fishy about this number.
I also signed up for surveys a few months ago, but I never give my phone number. If I absolutely have to give one it's always a made up one, so I don't know how they figured it out.
I got this number calling my cell number which is unlisted and I have no landline. I never give out this number so I don't know how they got it and they refuse my orders to stop calling and harrassing.