Flareflyer
You may be aware that the HSBC here is just a franchise; ie some local outfit pays to use the HSBC name, and in return has to abide by their 'code of conduct.'
I had grief here some years ago, and they refused to address the problem. I emailed the CEO of HSBC worldwide, and within a very short time the idiots here were sorted out; maybe you could try the same. The email address is;
[email protected]
Worth a try .............