They called on the business line this morning and did not leave a message. I have no idea who HSBC is...some kind of banking/investment company? Again...I have been on the DNC Registry for years and still we get flooded everyday with annoying sales calls.
HSBC is one of the largest banks in the world (I saw third and fifth on different lists). They are certainly a legit organization. Now, that doesn't mean that your call was indeed from HSBC and not from some scammer pretending to be them.