Tak Yi Ho

Hi I was told via a letter from HMRC that I needed to pay tax on my saving interests during 2023-2024. However half of the time, I was a student under Tier 4 student visa. Then I started my full time job in sept 2023. My understanding of the saving interest tax related to Tier 4 student visa is that it would not be taxed. I want to confirm this is true. What should I do next if the HMRC over taxed me for my saving interests? Many thanks