Update....it is "Survey research"
They want to ask u all kinds of questions!!!
About everything.
Just an FYI!

I get 4 calls a day, how can I make this stop?

same as everyone else reports.
Hey, SSI, I've got your number and your city - won't be long 'til I find your address - and I'll be banging on your door. Continue and hide well, or stop and let's avoid something you don't want.

I answered and a man asked for Joe. I said he wasn't in, but (meant to tell him I would take a message)..he hung up immediately....rude. The caller id showed SSI. I usually don't answer unknown calls, but SSI sounded like something to do with the government, so I answered it.

It is apparently a survey company (Survey Sampling International). On their website you can opt out. Or you can just email them at optout@surveysampling.com and include your phone number in the body of the message. I have no connection to the company or proof they are legit. They say they "sample" for a number of companies and will honor an opt out. No idea if they will or not.