I got rung in the UK I think a month ago from someone claiming to be from Coinbase. I told them I only had about £5 of Bitcoin cash in my account (which was true), and they immediately lost interest and said a forthcoming email would handle the matter.
They also asked if I had cold storage. I told them I had a fridge (also true).
They also asked if I had cold storage. I told them I had a fridge (also true).