This number had a caller ID of Sykes for me too. I am sure they handle followup calls for a variety of companies you may have dealt with in the past. If they don't leave a message, it can't be too important. I am certain USAA and Wells Fargo are clients....to name a few.
I got a call from this number and the message left was from Culligan. They wanted to tell me about their new under the counter filtration system. They apparently went "green" and are discontinuing water delivery service. The call back number is 866-463-8384
This is Wells Fargo calling trying to get you to change your account since the new laws came into effect 8/1. Sometimes they leave a message but they are really annoying.