I called back the number (02) 5133 5305 and reached vm that did not mention the company name

Caller: ?

Trying to sell BitCoin.

Only words said to me were about the Australian bushfires, guy had a muffled American accent, and when I stopped talking, it dropped out. I could hear a lot of other voices in the background. Stinks of scammers to me.

I called them back and she didn't say a company, couldn't understand much, since there where so many people in the background and she just hang up.

Trying to sell trading using Bitcoins. Sounds like Scammers. Blocked and put in the do not answer list. Sure they will try again using a different number. Damn nuisance