Taimur Khan

Hi I setup a company with companies house in November last year. Unfortunately the address I has used had a mistake. I have fixed this at companies house and requested the UTR several times but I have not received it. I have called HMRC but I am being told I cannot get the UTR on the phone , only by mail. But the mail request is not working. I need to apply for SEIS Advance assurance but for that I need UTR. I am completely lost in what to do. Can I get face to face appointment anywhere in UK where they will check my ID and give me my UTR? Any other hints or tips because this seems to be a roadblock for me.