Unfamiliar number.  No message left.  Must've been *real* important.

Calls work. When phone is answered they hang up.

Called several times, asked for a Robert.

when you answer, no one is there and then after about 30 seconds they disconnect, WTF

Information:
Your post is very similar to FAQ #13, in the list of Fatuously Asked Questions (FAQs) asked here.
Real answers to those questions or statements or demands are summarized at
http://phonehelp.2truth.com/faqs.html

Remember to return here, to 800notes.com, after visiting that site, and let us know if you need additional help.