HSBC publishes their relevant phone numbers so usually I just call them back. Recently they also have started sending texts instead. They text that "you card e

HSBC publishes their relevant phone numbers so usually I just call them back. Recently they also have started sending texts instead. They text that "you card ending with xxxx has been used for a transaction of x money at y company, did you make this transaction?" and you just reply Y/N. If you don't reply they start calling.