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I am a solicitor.
I would suggest that you contact the Home Office and see if they are able to assist you access your paperwork/change your email: https://www.gov.uk/contact-ukvi-inside-outside-uk/y
May I help further?
You may try and lodge a complaint with UKVI, that may escalate the matter, otherwise I am afraid you would need to try and get access to your email account: https://www.gov.uk/complain-uk-visas-immigration
All the best