Self-Assessment Amendment and Tax Refund

I'm awaiting a tax refund from my 2021/2022 Self Assessment, following an amendment submitted online via an accountant in January 2024. The purpose of this amendment was to correct errors and ensure the accuracy of my tax return. The amendment was submitted within the timeframe. Despite timely submission, HMRC hasn't issued the refund yet. I've called HMRC multiple times to resolve this matter; every time agents have consistently advised me to await a response within two weeks and to send follow-up messages to the amendment team, but no substantive response. Given the prolonged delay and the absence of a satisfactory resolution, I kindly request guidance on the appropriate process to escalate this matter and the relevant contact(s) with whom I should communicate to expedite the processing of my tax refund.

Hi
If you would like to complain about the time taken to process your refund, you can do so by visiting gov.uk and searching for 'complain about HMRC'.