I missed two calls from this number. When I called back it said all circuits were busy.

same

No message left, no answer.

I don't care who it is I know nobody from Texas.  I cleared the caller ID out and replaced it with "FUK U" spelled just like that.  When they call again, my landline phone announces the name and it sounds perfect.  So no need to get all upset when they call back again, just laugh.  I don't waste my time blocking numbers because they will call back using a similar number.

Called at 9:40 AM EST. Didn't answer and no message was left.