Second request for tax payment when I don't live or work in the UK

In 2022 I was asked to pay an outstanding amount of income tax for the tax year 2020-2021. I raised a formal query as I have not lived or worked in the UK since 2006. The amount disappeared off my online records when I signed into Gov Gateway a few months later and I noticed that the query was closed. This month I received another letter asking for the same amount for teh tax year 2020-2021. How do I resolve this?

Hi
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