Self Assesment Issues

I was tasked to self asses my tax. I completed it, but obviously not completely as I got a penalty notice. When I log in to my personal tax account I can't see anything to do with my self assesment. I logged in and tried to register again for the UTR code I recieved an email saying "you already have a live Self Assessment record with a Unique Taxpayer Reference (UTR). It may be that you wished to arrange to complete and submit your tax return online. To do this you have to register for our Online Services which can be found at: https://online.hmrc.gov.uk/registration" Now when I try and register again the web page is saying that the service is unavailable - and has been showing this for days. How do I proceed here, can anyone point me in the right direction?

Hi,

If you are unable to locate another Government Gateway ID you will need to contact our online services team.

Technical support with HMRC online services

Thank you.