Congratulations on receiving an offer to study at The University of New South Wales!
I tried contacting you today by telephone to talk to you about your offer but was unable to reach you.
Could I please ask you to reply to this email to let me know whether you are intending to accept your offer?
You can also take this opportunity to ask any further questions you may have.
I look forward to hearing from you soon, and wish you every success in your future studies.