Nick Hungary

I paid missing gap years 2021/22 and 2022/23 in January 2024 but the payments are not showing on my HMRC account. Why is it taking so long? The two missing gap years were paid together. I entered the relevant information as per instructions so HMRC could identify my HMRC account but they are not showing up. Why? Should I write to National Insurance Contributions and Employers Office? If yes, what information should I include on my letter to them? is it safe to include my N.I. Reference No. ?