Who to speak to about paying voluntary contributions after moving overseas?

I plan to emigrate to the EU next year. I have checked my NI record and it gives me a number of years I still need to contribute before reaching pension age to get the full state pension. I have read all the guidance on qualifying years, and that on moving overseas, but some of it is contradictory. I will be working for myself when I go overseas and will close down my UK Ltd company. I want to talk to a person to clarify what class of contributions I can make once I move, and if I just need to make them for the number of years my NI record says I need. I cannot find the right number to call. Please can you direct me to the right place?

Hi EB123,
You may wish to read our leaflet NI38 ‘Social Security Abroad’ available  here:
Social Security abroad: NI38
Which explains about the different classes of voluntary National Insurance contributions available to you and how to make payment.
You may also wish to obtain a State Pension Forecast available here:
Check your State Pension forecast
Which will detail your current and future entitlement to a British State Pension.
As you have requested, our National Insurance Helpline numbers are 0300 200 3500 (from the UK) or +44 191 2037010 (from overseas).
They will be happy to discuss any National Insurance queries that you may have.
Thank you.