866-335-9398

I've been receiving repeated annoying calls during the last week from different callers, asking for someone I don't know and who doesn't live here. Each time I told them to not call again, but the calls keep coming. Extremely frustrating. I jotted down the last two calls:
Fri, Oct. 16, 11:36 am message: “Chris” (hardly intelligible) from “Chase Bank”, asking for someone I don't know, regarding a “financial matter”, message says to call 888-293-5321.
Sat, Oct. 17, 10:45 am “Elisa” from “Chase Card Services” again asking for someone whose name I never heard; I ask for her name and phone number, she gives the number 866-335-9398 and then hangs up.
I googled these numbers and found numerous complaints, smells like a scam. I complained with the Federal Trade Commission. Do not give these people any information.
This is following 3 or 4 calls during the preceding days

Once or twice a day, phone calls which my caller ID shows as a legitimate Chase Card Services phone number.  If I call it back, it's actually Chase, and there's nothing wrong with my account.  However when I picked up the call a guy asks me for information, gives me some card number and address which doesn't match me at all and says I can make a payment with them right now over the phone or call (866) 335-9398.

That number doesn't appear to be a legitimate Chase phone number.  Seems like just a way to try to get people to make over-the-phone payments in some kind of scam.