Got this call on my landline. Claimed to be from "Technical department of Microsoft". Claimed to be receiving warning messages from my computer that someone was trying to hack it. Claimed to have my Windows Login id.

Scam.

The first time I got a call from this number, I asked for a number and I would call them back....they hung up. The second time, I asked for the number to call right back, they gave the same number, so I called from another line, and he answered the line without hanging up or putting me on hold. It is not a call center environment but 1 person.
Since I use a Mac and then said as such, he acted confused, he said he had a wrong number and hung up on me.