The telephone number 0345 266 9337 is a genuine HSBC phone number, so if you are a HSBC customer you should answer the call. You may also be advised by the HSBC customer service team in the event of a failed payment or suspected fraud.
The phone number 0345 266 9337 has been reported to use several times as a genuine HSBC number. The most common cause for receiving a call from this number is because of a suspected fraud on a customer account. Therefore you should answer calls from the HSBC number, because they might be phoning to make you aware of suspect activity on your account. The most common reason that customers receive a call from 03452669337 is when they make a large payment or several payments over a shoty period of time.
HSBC usually then put a flag on a payment until they can verify that it is coming from the account holder.