No reply by post for form submitted online

Hello HMRC, I have submitted a "Self Assessment: Request removal from Self Assessment" via form online, with reference number "HMI-E9CM-7QO". The form is marked as "Completed" in my "Check progress" tab online in my personal tax account. However, I have not received a reply from HMRC by post. My previous form with reference "CL3-U1KM-C9O" I have received a confirmation by post. Can you either resend the information by post or let me know how I can view the response online? Thanks

Hi Tim,

We would need to access your record to see if your Self Assessment has been updated.
You will need to contact HMRC direct. Self Assessment: general enquiries

Thank you.