Who called from 8566243399

I keep getting calls saying something is wrong with my computor and they say they are from Microsoft
I would like to report this phone number  856-624-5599

I got a call this morning and they said somting was wrong with my computer my computer was not even on,

How do I stop this?

I think this must be a scam. How do I keep these guys from calling back!??    I don't even live in the USA.

They claim to be calling about a Microsoft problem but they don't appear to be from Microsoft. He said his company was Home PC Tech I think.