Hi Paul from Aus2 Frances,
Thank you for your enquiry. Unfortunately, without looking at your personal records I am unable to confirm if you have been correctly advised with regards to paying voluntary National Insurance contributions whilst abroad.
Your online National Insurance records will show years where you are deficient, and how much those years will cost at the voluntary Class 3 rate. However, before making any payments, you would need to check with the Pension Service, whether making these payments would benefit you. Further information can be found on the gov.uk website -
Pay voluntary Class 3 National Insurance: Overview - GOV.UK (www.gov.uk).
Because you are over state pension age, your application to pay voluntary National Insurance contributions would be processed by the International Pension Centre rather than HMRC. You may wish to contact the International Pension Centre to check if your application was passed to them to process. Their contact number is +44 (0) 191 2187777. Lines are open Monday to Friday from 8am to 6pm.
Thank you.