You can request an internal review and then go to the Information Commissioner, but ultimately they’re all rather toothless.
I did this for a variety of reasons against the Home Office (Firearms Dept) some years ago - they got a hefty smack on the wrist from the ICO for their failures. It’s a huge embarrassment issue & not politically acceptable - especially if the person / department is being less than frugal with the truth…
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Just noticed - he should have asked for WhatsApp messages too.