X Sending Verification Codes to Closed Account Phone Number

I previously created an account on X (Twitter) years ago and later permanently closed it myself in a secure manner. However, despite no longer having an account, I received three consecutive verification code SMS messages from X this morning.

I have not shared or transferred this phone number to anyone, and it is not being used by any other person. Despite this, I am still receiving verification codes, which is both concerning from a security perspective and highly disturbing.

I request that my phone number be completely removed from X’s system and that all verification or security code messages sent to this number be stopped immediately. I consider this situation a serious security concern, and I would like it to be addressed urgently.