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Hi, Sam here , one of the UK tax Experts here on Just Answer, thank you for your question and I shall reply shortly
I am afraid you would need to take this through court for HMRC to consider this an allowable loss, so that its proven to be such- have you done so ? What was the outcome ?
Then I am afraid that unless you have evidence to back up the loss through these means then HMRC simply will not accept consideration of the loss and a lack of success through VISA charge back and the Financial Ombudsman actually further negates the ability to claim this as a loss with HMRC or they would have held up your position (and then there would be no need to consider a loss as you would have been reimbursed)
Sorry the news is not better