It's actually SSI, 701 E. Timpanogos Pkwy, Bldg M, Orem, UT 84097 USA, 801-373-7735. Contact: Gordon Bishop, [email protected].  They get contracted to do surveys for all sorts of businesses.

Watch for either 801-899-4121 or 801-899-4131.  They also have offices in Connecticut (203) and Ontario, Canada (905), but I've only seen calls out of their Utah Call Center.  

There is supposedly a "legitimate" opt-out form on their Web site:  www.surveysampling.com under "Received a Call from Us?".