I'm on the DNC list and have a silent number that I only give to friends & family - they keep calling and hang up as soon as I pick up the phone. Highly suspicious

Said was from Microsoft I know your serial No if we don't take a look at it you will supseptable to problems. We said goodbye.

Has called every afternoon around 5:30 pm. for past 3 days. Answering machine answers; no message left. Suspect they are either marketeers or scammers.

Answered. Hung on, waiting for a voice. After about 20 seconds, all I heard was 'Goodbye'.