I just got a call from this number as well. He started going through disclaimers and all that and was going to "look" around for a better autoloan to refinance to. He asked me for my last 4 digits of my SSN so I hung up and called wellsfargo fraud number and they said they dont see that number on their phone contact lists and to block the callers number.
I called my local Wells Fargo branch and they did verify the sales person's name and his direct phone number from their internal system. He is a Well Fargo Employee.