Got a call from this number on my home phone. Caller ID said "I" so I ignored it. They called back about a minute later. I Ignored it again and looked up the number. No message left

Same. I on the caller ID. They've been calling for months almost every day. Never leave a message.

Received call from 571-364-0349. on 11-11-15 08:26, Caller ID displayed Manassas VA. No message was left by them.  I returned call and received an answering system giving me the office hours and I proceeded with the prompts. Hitting the pound key instead of entering my phone number. A recording came on telling me that a representative from which ever company that called me would be returning my call.      " Sounds like this is a telemarketing company to me with one number display outgoing."