Phone number already used (not by me) (yes, i'm sure)

So I have this problem with my current phone number where I can't add it to my discord account just because someone else is already using it. Just to be clear I never added my phone number on any account by mistake which means I can't delete it myself.

In february of this year I sent an email to discord support saying exactly this.

They never fixed my problem.

“our support team is working hard to get back to you”