Voluntary contributions for pension. Now living in EU

Hello, I paid a few thousand euro of voluntary contributions in the last 12 months after applying to plug gaps in my record. I'm currently living in EU. I haven't heard back when other colleagues in similar position and timeframe have. If I want to apply for a refund then how do I do this and how long will it take?

Hi London1983,
Please contact the National Insurance helpline to check if your payment has been received, and to discuss your options on applying for a refund. The contact number is +44 191 2037010, lines are open from 8am to 6pm, Monday to Friday.
National Insurance: general enquiries
Thank you.