Blocking the number is the best option
Hiya is another great spam call filtering tool to help prevent and minimize this in the future. Sometimes they give the name of the caller too. There are so many now, just google search for “spam call filtering” will return a bunch of results.
If its a buisness calling, they run the risk of thier phone numbers being flagged as scam likely and can become very expensive to fix. As mentioned above you can report through TrueCaller, hiya of any of the major cellular carriers now which would more than result in the number becoming flagged, especially these days.