I received a penalty notice but the UTR is not mine

Hi I have received a penalty notice out of the blue for a missing tax declaration (tax year 2022-23). The UTR displayed is not mine and I find this quite stressful. I appealed and shared the records about my submission and associated payment. Despite that, the initial appeal was rejected and I will now have to ask HMRC to review the decision. I tried to talk to HMRC, but it is very hard to get through. HMRC is suggesting to pay the penalty but since the UTR is wrong, I am afraid I would simply lose £100. Any idea how this could happen and whether there is anything else I could do?

Hi

It could be that a duplicate Self Assessment record has been set up for you.
We will need to access your record to review this for you.
You can contact HMRC by phone or webchat at Self Assessment: general enquiries

Thank you