Request for removal from Self Assessment - no response

I filed in November 2023 a request to be removed from self-assessment. It advised you will be told within 15 days. It's now the end of December and no response. Status just says `received`. When am I likely to hear?

Hi

I'm sorry that you haven't received that confirmation. 
Contact us by webchat or phone via Self Assessment: general enquiries and we can confirm the closure of your record.

Thank you