59 Week Backlog For NI Record Corrections!

Called the Nation Insurance helpline 4 weeks ago - I have 2 years (1988/89 and 89/90) where voluntary payments were needed, and were made in full but the years are showing as incomplete on my HMRC NI record. They advised me to send all the evidence to an individual caseworker, which I did. Just followed up to see what is happening, and my letter with evidence of payment etc was received, but I was told that there is a 59 week backlog in cases, so I shouldn't expect to hear anything for over a year! Is this correct? 59 weeks is quite a substantial wait!

Hi Yorkie99,
Thank you for your enquiry.
Timescales can change daily depending on the workloads.
We can confirm that the current timescale for the department that will process your application is 36 weeks.
They are currently working on post received on 14 December 2022.
Thank you