this #, along with many variation (I'm sure from the same place) including 503-820-0073, 503-820-0076, 503-820-0078, 503-820-0079, etc have been calling me at least twice a day, every single day for over a month. Never any messages, so I'm sure it's either another persistent marketing calls or some loser who really really needs to get a life.

503-820-0076---Called once, I didn't recognize the number, so I sent them to voicemail.  They called right back and I let it ring through.  They wouldn't leave a message.  I called the number back and a message says 'the person you have attempted to reach is unavailable.  Please leave a message.'  White pages says it is a landline in portland, OR