Spam call for some seminar junk

I called back number 0480 027 290 rang once then gets disconnected automatically.

Said they were from seminars Australia and then hung up when I didn’t respond.

Called back and there's just a beeping sound on the other end.

my phone said potential fraud

Offering free seminar, change your financial situation, etc... I said not interested many times and he just hang up without saying thank you.
So rude.....

I called this number back and got an automated message saying that the call cannot be completed at this time and to call back later. My guess it that it's a call centre and trying to sell me something, hence no message was left.