This number has called three times this week, including twice in one day. Doesn't leave a message. Declaring it a spammer.

This number calls i do not answer, why am i on the do not call list?

Don't ask us,  you signed up for it.   Didn't you bother to read all of the information concerning what calls it applied to and which it did not?   You didn't even answer,  how do you know who called you in order to report?
Unless your caller attempted to sell you goods or services,  and is a registered with the FTC Telemarketer,   It don't APPLY.

These people call any hour of the day, several times a week.  IF I answer, there's either no one there ... OR they tell me I qualify for a new diabetes glucose monitor, and begin asking for all kinds of information.  THIS IS A SCAM!  Hang up!  Ask FCC to block the number.