I too avoided it; I had an interesting interaction with the (American) call center scammer -- he called, said his story; he gave me a callback number when asked; I asked him for a web page I could verify a callback number. He quickly rattled off a legitimate Coinbase webpage URL, I believe their ToS page, which does include a phone number. He then hung up rather quickly.

Sadly for the scammers, that number didn't match. But, I note it was part of his script to sound confident and give a working URL. Pretty strong.

They frequently have nicely done webpages, which have this phone number on them. So you need to find the URL yourself.