I received very same call just then, and I actually called that number and gave them 'reference number' the previous call gave me and as well as spelling of my first and last name, she said one minute please and hanged up on my face. Do you think they'll be able to access any private info with my first and last name?

I kept calling until they picked up. So I asked for her name "Kristen" apparently and asked why she hang up she then said "F**CK you, B**TCH. I scared her by saying the phone call is recorded and well go to the police

Person by the name Adam Williams called claiming to be from ATO grants area, asked me to call (02) 6100 4075 with a reference number that he gave me to claim my $6500 grant cheque.
I did called the number and I spoke with a different person which she answered as a ATO personal and she asked me for the purpose of the call and I told her that I was claiming the appreciation Grant that I was told about and she asked me for the reference number, I gave her the Reference Number and she went away to check it out, she came back and she told me that every think was ok and she would give me a 6 digit unique code to claim the $6500 grant at a Commonwealth Bank, Westpac Bank or NAB Bank (only to name few). But before she could give me the Code " I would have to make a donation to a charity fund and she mentioned few. (Obvious this is a scam, isn’t?). I told her this is a scam and I hanged up.

Person called claiming to be from ATO grants area, asked me to call (02) 6100 4075 with a reference number to claim my $6500 grant cheque