This must be a scammer pretending to be WF bank. All phone numbers listed on WF's website https://www.wellsfargo.com/help/phone_dir are toll-free numbers so I doubt that the real WF bank will ever use a non-toll-free number as a call-back number.
Just received a call on both my cell and work number (back to back). I spoke with Wells Fargo this morning using their 800 number. I checked these comments and also found that WF would not use a 515 area code. There was no message left on either number. I am in good standing with WF by the way!!!