This number called this past Friday after I left for the holiday weekend. This particular caller seems to have a penchant for calling when people are out of the office.
According to my call logs, we've received calls from these additional numbers, all having the same caller ID of "MERCHANT":
http://800notes.com/Phone.aspx/1-360-205-8049 and
http://800notes.com/Phone.aspx/1-574-406-7029
I'm not sure if this is Better Merchant Services or a different credit card processing company.