Message from "Moe" at Quicken Loans, claiming I'd looked for refi info online, and requesting more info (I had not done so). Had received earlier calls on Friday from the same Caller ID, but from numbers 313-338-1067, 313-545-0219 and 313-545-0228. Per another post on 800notes.com, unlisted number 866-269-9419 may also be related.  Very odd.