Who call me

Thanks for your suggestion but I had told them all detail about my credit card. Is it risk for me to be scammed?

Think about it.  If your Government is anything like ours in the UK they don't give money away!  In fact, it is hard to get money they do owe you. They certainly don't do it by 'phone they like a nice, long, paper trail to follow. Ther are a lot of csams hitting the UK which are just like this one.

Rang this number back, to find its Woolworths General Insurance. Hung up after finding out.

I have had a call from this number on my mobile. I do not know this person

This number called me and told me that I got free income from Australian government