Apply for a UTR No

When I applied for a UTR number, I have wrongly filled in "Date started receiving foreign income- it should be 06/04/2023 and I wrongly fill in 05/04/2023. 05/04/2023 will fall into a different tax year. I cannot find where to make such correction. And CS of 03002003600 said that she could not help. Where can I contact to make the correction

Hi,
If you have no other Self Assessment criteria in 22/23, we should be able to cancel your need to file a 22/23 Self Assessment return.
Contact us by webchat via Self Assessment: general enquiries to allow us to do this.
Thank you.