Who called from 7202409308

Getting repeat calls from within minutes from this number or some variation of it.
They just call and hang right up

Same kind of problem - got call-bombed from them (multiple numbers calling my line simultaneously), from several numbers in Colorado and one in Pennsylvania.

Just got a call from 720-240-9308, and they didn't leave a message.  How do they get our numbers?  Is a company I've used given it to them?

Same as others. Received two calls from 720-240-9308, but I didn't answer the call because I didn't recognize the number. Caller didn't leave a message.

Same as above