See who's calling

They claimed to be HSBC, telling me my card had been used by someone else, which is not the case, and asked for my personal details suspiciously, and knew my account numbers and stuff, suggesting that the number they are dialling from is the HSBC number right behind the debit card details to prove they are legit. I then refused to answer their question and called HSBC directly, they told me there weren't any sus transactions. Don't trust them, and change your card details asap.