A non-UK resident unable to access HMRC support

I have acquired my Government Identification number, but due to limitations in this process, I am unable to verify my personal information due to HMRC expecting current UK-based information (eg. financial, driving licence etc.) from someone) who is 26 years no longer UK-resident. An alternative option assisting identification had required a UK address. This being asked of someone who is non-resident in the UK for 26 years. Furthermore, with long delays ( averaging 40 minutes) currently of the telephone Income Tax enquiry support of HMRC causing unaffordable use for overseas callers, the whole system renders itself inoperable. I truly have no idea of what to do next.

Hi,

If you are unable to access your personal tax account or other online services, and would like to discuss your record, you can contact our Income Tax team.

Income Tax: general enquiries

Thank you.