Compiling companies contact information

I am looking for someone who will be able to find the contact details (via any means) of 350 Australian Companies. The information needed to be found is: • Company Head office phone number • Company Head office Delivery/Postal address (can be street address, PO Box or GPO) I will supply a Microsoft Excel document with the names of the Australian companies, and the Microsoft Excel document will need to be sent back to me once the information has been found. If work is completed to an acceptable standard, more work will be required by you in the future. Thank you.