I put my name and phone number into a registration site for (https://digitalyuan-buy.com/).
I was very foolish and have learned a valuable lesson. I've since received more than 40 calls from different numbers harassing me for more information. The numbers appear to come from Sydney or Melbourne though I suspect are virtual numbers from overseas. Some examples are 0383738614, 0272018990, 0272018986. The person calling will sometimes give me their name. Some have stated they are from London, another Sydney. I read another forum advising it is best to state you are recording the call and simply repeat "please add me to the do not call list" however they won't remove my number from their database.
One actually threatened to share my details further and to expect calls at all hours. They do not seem to care when I mention I will pass on their details to the police. Out of spite, I actually used the numbers that were calling me to register new accounts so at least they were harassing each other however there is no answer or an automated message when I try to return a call. I also thought of speaking quietly so they turn up their volume then blowing a whistle into the receiver however have discovered modern phones have noise limiters. I've reported offending numbers to Scamwatch.
Any other suggestions would be most welcome.
Only answer calls from your known Contacts and ignore everything else. Simple yet effective.