called so many times during the day never speak, silent caller and then hangs upgetting very disturbing

I received a call this morning at 4:34am from this number, I answered the call but nobady's there.

I was lucky they called me at 11 Am, other sourses say that it is fraud and ID theft don't give any info or even answer.
Added to my blocked callers list.

also got a call from this number asking for my name and started cursing at me and I just hung up...

I was lucky they called me at 11 Am, other sourses say that it is fraud and ID theft don't give any info or even answer. Added to my blocked callers list.

i got two called today .. and last month also two calls .. when i answer the phone there is no one ..then they hang up .. its really weird and i'm afraid is like Criminal organization to check who is home or not .. who knows