I had the same call. From "Mr. Carter" from "ATM" wanting to review the "supply charges" for my Ameren bill.
This # called my mobile, left no message. Has same first six digits as my mobile.
Holiday Harbor
20061 Shasta Caverns Rd, O'Brien, CA 96070
https://lakeshasta.com/
Mid-May to Mid-September: M-Sun 8:00 - 6:30
Holiday Harbor Resort and Marina has something for everyone at beautiful Shasta Lake in northern California—houseboats, toy rentals, camping, fishing, boating, and more.