My Account is Locked

my account is locked because of sespecious activity. when i access my accoun, the 2 factor authentication is considered using my phone number, till now all is good. the problem is: when i want to unlock my account, they request verification with an old phone number that i removed and replaced with the number that i am using for 2 factors verification. i summary, the access use the new phone number, but unlocking process use the old number that was removed. and i neither have another option available to unlock it, nor i can contact clients support,

What can i do please !

Any ideas !