Don't try the toll free numbers

TOLL NUMBERS:
All Other Countries (International charges Apply) +1-800-852-4719
+44 -207- 537- 8300
+350-50509

In Australia dial 0011 + country code + number

So 0011 44 207 537 8300 or 0011 1 800 852 4719 should work

Not sure what country 44 is, 1 is Canada. Also check that you have international calls available on your phone line, often there is an option to block them.