As mentioned, the acronym SSI used with search (SSI survey) directs to this company https://www.linkedin.com/company/survey-sampling-international with website. Another search "SSI OPT-OUT" directs to their webpage on how to stop the calls see https://www.surveysampling.com/contact/opt-out-do-not-call/
Received a call from this number and left a message in Spanish. However, they did ask for by name. No idea who they are but SSI has called before. I believe a scam and they change the numbers and purpose of call.