Please do not call back or answer the number (02) 9155 7771. I believe that number used by hacker whom trying to grab your personel detail. later they will use your detail to login internet banking.

It's Westpac. start talking about home loan package and tried to sale insurance.

Several calls to landline & mobile. Eventually answered landline. Dwayne from Westpac asked if I'd received correspondence from them recently & if I wished to continue discussing the specific contents of that letter I would have to provide him with some security details not pertaining to banking but I don't have to if I don't wish to proceed - he'll call at another time more convenient.

Saying he is from Westpac. But I couldn't search this number on google

I called back number (02) 9155 7771 spoke to a woman who said company name is Westpac.