I think it’s related to the bitcoin scam involving shark tank people being fraudulently set up as endorsing the scheme. Google it

This number and also (03) 9088 1353 are both from a company involved in Fake News about supposedly huge returns from trading Bit Coin.
Don't have anything to do with this company.
The callers are Indian and probably not based in Australia even though the number appears to be.
Ask to remove your number from their database and to never call you again.

Indian accent, "Andy" from "Customer Service"