I just got called by this number today. I tried calling it back, but the number is inactive.

My company registerd us for the IWCE convention in Las Vegas and the calls from (416) 504-9427 is a hired company calling to confirm your attendance and information for the trade show.  I recived almost 20 calls today.

Yes! I get the exact same thing, they call me atleast 5 times a day! I am really getting POed at these scammers. Is there anything we can do?

They have ben calling the main reception line at my office & tying up our whole phone system for the last hour.
We've been hanging up on them, as there is no message or anything when we answer. Tried transferring it back to itself to tie up their line instead.

You have message, no message

This number have been calling us every day except weekends for over a monththe few times i've anwered without checking the number first the line was open but no one would say anything.  Just weird.  They call everyday and hang up just before the call gets to the machine.