I've just had a missed call on my mobile and checked the voicemail:
A nice chatty London voice (female) says
Hello Mrs ...... my name is .... at ...... Bank, ..... Branch, can you please give me a call on .........
The number appeared to be a mobile beginning with 0777 so that made me suspicious. I phoned my bank on the known Telephone Banking number and they confirmed that no such call came from them.
I was almost tempted to call the number to give them a piece of my mind, but best not! After all, they know my mobile number, bank, and curiously, nearby but not nearest branch, so likely have my address.