Halifax - Halifax refuse to help over an investment scam

Dear Halifax,
I would like to make a formal complaint about Halifax and specifically someone called Suzanne in ‘Investment Scams Investigations’
On 17th June 2025 I contacted Halifax Fraud line asking that they investigate an investment scam that I had fallen victim to.
I gave the person I spoke to (Clara) lots of details and Clara explained that she would put me through to the correct team. Next I spoke to Lana. I offered to give the reference number I had been given by TSB (the scam also involved funds I had with TSB) and I had already contacted TSB who were very helpful. TSB Fraud advised me to pass on the reference number they gave me to Halifax. Lana did not want the reference number telling me that Halifax would not contact TSB. After quite a long conversation Lana told me that it was not something she dealt with anyway. She then put me through to someone called Brandon. I then had a conversation with Brandon of some two and a half hours. Brandon then gave me a reference number ***** and told me that Halifax would not investigate it because they did not consider it was a scam. Meanwhile TSB simply got on with their investigation telling me that I did not need to do anything, they confirmed it definitely was an investment scam and some days later they contacted me to let me know that they had managed to get all my money (that had come from my TSB account) refunded to my account. They advised that I contact Halifax regarding the money I had been scammed out of from Halifax. I thanked them and duly contacted Halifax. I spoke to someone called Richard who was helpful and Richard put me through to someone who identified himself as ‘J’. J went through lots of things with me and then told me that Halifax wouldn’t investigate it as a scam. When I protested that TSB had confirmed it definitely was an investment scam and that they had gotten all my TSB funds refunded to my TSB account, J announced that he doesn’t deal with investment scams. I asked J to please put me through to someone who does. Next I found myself talking to someone called Suzanne (I had to ask for her name, she didn’t offer it) Suzanne was surly from the outset telling me that there was nothing she could do but after I gave clear details and explained how TSB had solved everything regarding the money in my TSB account, she then said ‘yes, it is something I can help you with’. Suzanne was difficult to deal with and she kept peppering the conversation with comments like ‘have I got your permission to speak ?’ She was surly and very rude throughout and finally she returned to saying that she couldn’t help - she also repeated several times ‘TSB can take the money they recovered for you back, did you know that ?’ She was very unpleasant and then she told me she was terminating the conversation. I told her I wanted to make a complaint and she just put the phone down on me. I am still £1843.31 out of pocket for the scam that involved Halifax and I would like Halifax to address the matter please. I cannot believe how different the experience was with TSB - they were a delight to deal with.
My name is ***** *****
My Account number is: *****
Sort Code: *****
Please help
Thank you
*****