"Dell support" scam calls?

I have been receiving calls from 1-800-624 9896 claiming that our Dell computer is sending messages to Dell on a virus attack. When I tell them the computer is at the moment in storage, one time the call got disconnected immediately. Just now he asked "how is that possible, can you turn the computer on so I can guide you through some steps?" and when I then asked to talk to his manager and said I suspected he is not from Dell, the call again disconnected.

Sounds like a scam to me. Can you please investigate?