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I am a solicitor and will try and assist you today.
Which broker is this? Do you have a website for them?
As I await your response, you should report them to Action Fraud Police: https://www.actionfraud.police.uk/reporting-fraud-and-cyber-crime
The broker is very unlikely to be regulated by any authority in the UK (FCA/PRA).
All the best
We do not need to have a conversation, no worry.
I have already responded to you, the broker is not regulated in the UK.