Has anyone tried calling them? Are the phone numbers real or fake?

By the way, this is a good idea. Let anyone have such an opportunity will try to find out the real is the phone number or not.

And why should the team leave their own number? it is very easy to check

They left their numbers, most likely to have a personal connection with potential investors.

The easiest option is when a person wants to invest a large amount, for example, you can always call and chat with the developers

We do not ask you for money. We have our own investors. Which paid the whole project.