I have had the same for the past two nights.
Has anyone figured a way to block them?

I've been getting calls from this (07) 5562 9900 number also.  Very annoying.  I tried calling them back and got a recording saying try later the area is congested.

(07) 5562 9900, has called my mobile once each day at the same time 1:43pm for the past 2 days , hopefully it stops here, but thanks to everyone online for your comments or i'd still be trying to figure out what's going on, now i can ignore all further calls. :)

Just had a call from this number. I'm in Australia.

I just called that number, spoke to a girl who was very nice and helpful.

Told her I was getting loads of calls from her company and that there are several forums on the internet blasting the company and that complaints are being made to Telstra.

She sounded a little uneasy when I told her this so hopefully they do something about it.

It is from a seminar company about homes because one called me from (07) 5562 9900 and i said i wasnt interested and now i get prank hang up calls from them cause they are bored useless idiots that have nothing better to doI