Tell these people to stop calling me

Calls a couple times a day but won't say anything..read elsewhere he is claiming to be from Microsoft..and has a strong accent...

Second call in as many days.  Leaves no message.

called me three times already. second time they called no one answered. they called again today. after a long pause with a lot of background noise someone with strong accent said " I am calling from Microsoft. It's about your computer, okay?" ... and then nothing.

7 calls the last 2 days, didn't pick up