Please do not divulge any sensitive data.

It is our intention to provide you with the highest possible level of
customer service at all times. However, we recognise that things can go wrong on occasion and if this occurs, we are committed to resolving matters promptly and fairly.

Should you not be satisfied with our final response, you may be entitled to refer the matter to the Financial Ombudsman Service (FOS). More information is available on request or on their website 
https://www.financial-ombudsman.org.uk.