“Millions of pounds and euros are lost each year through fraudulent calls made to financial institutions’ call centres. In the UK, such companies lose £20 million a year, with the one in 700 calls recieved being fraudluent in 2015, compared to the one in 1,700 in the USA during the same period.”

Source: Q&A: Why are call centres so vulnerable to fraud and cyber crime? | Technology | Business Review Europe