So what the scammer probably did was he deliberately locked your account by trying multiple wrong passwords. Then he gambled on you googling and finding that number to call. My my, are they smart. They come up with new schemes every single day.
Guys, be careful.
You are so right. I am wondering if a large number of users are locked out, or just a few ones with coins stored in Coinbase.
Damn coinbase release no statement regarding any hack happening in their site.