No confirmation received for self assessment registration and UTR is not received

I have registered for self assessment on 10Jan24, but I did not receive any confirmation for my registration. Is this normal or I didn't register successfully? Until today 19Jan24 I still haven't received my UTR number updated in my account. I have tried contacted both hotlines 3310 & 3600, yet I still can't get any help from direct hotline staff (just voice recording). How can I check if I have successfully registered or do I need to do it again? I will miss the deadline for self assessment submission if I cannot get my UTR next week.

Hi ckwok,
While it usually takes 10-15 days to receive your UTR once you've registered, it can take longer during periods when we receive a higher amount of registration requests.
Contact us by webchat or phone via Self Assessment: general enquiries and we can confirm the current processing timescale.
Thank you.