This number called my office early this morning.  Caller ID just showed their phone number and they left a 30 second empty voicemail.  Anyone else get this call or know who this is?

I got a call from them. They called to give me a code to log into my account. It's a survey site based in the UK. Don't know why it's a US number or why you'd get a call from them. Maybe it's a number used by others as well.