Who called from 3606675263

Got a phone call from this number. No voice message left.

Local number for me.  Called on 12/02/15.
Also called from:
360-205-7366 on 11/23/15
360-841-7115 on 12/05/15
360-268-8118 on 12/05/15
360-886-3284 on 12/05/15
All local.  All have caller ID "SSI."
I never answer and they never left a message.
BUT, a quick Google search turns up SSI as a market research company.

Spam call. Caller ID said SSI at 6:34pm.

3 calls in 3 minutes because I would not answer the incoming?