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When I give my UTR and NI number the next message pop up "The information you gave does not match an HMRC record" I already called HMRC (03002003310). First time CA said message to technical problem department who answered as they cannot help. Second time CA said she pass this problem to other department and still does not work however this is my details. I cannot complete the self assessment online, the paper form deadline is already overdue. Who can solve this problem if the HMRC staff cannot? What is the solution?
I look forward to receiving your response.