Can not deactivate my X account that has been logged in directly through Apple Touch ID

I followed the X guidelines for deactivation. The problem here is not being able to provide a password since I signed up for X using Touch ID (fingerprint). In order to deactivate, you have to provide the password you used to sign up. I tried using my Apple ID password. I tried going under Apps Using Apple ID, found X and clicked on Stop Using Apple ID. I logged out of X and tried logging back in with my Apple ID password. Even though I told X to stop using Apple ID, I was still able to sign in with Touch ID. For kicks and giggles, I logged out again and went back and clicked on Stop Using Apple ID again and tried to log back into X. My Apple ID password still did not work and once again, I was able to use Touch ID to log back into X.

I also followed X instructions for "forgot password." I provided the [Touch ID] email used for the X account but no email gets forwarded to the email account I use for Touch ID accounts.

I tried contacting X customer support but they say because I can not prove the account is mine, they can not deactivate it. I mean, the only information I used to sign up was a username and an email. I gave no other identifying information: I never listed a phone number, address, any profile information, etc. So, I gave them the entire two pieces of information I have/used to sign up for the account.

X customer service also told me I should contact my email support since I am not getting my emails forwarded. Fair enough, but I can't figure out how Gmail customer support can directly help me. I received an email from India that gave me a full page of multiple scenarios one may encounter while using Gmail-- might I add, none of which applied to mail not getting forwarded. Also, I went through the process of providing the email I used to sign up to reset my password so many times (about ten times) that I am no longer to use that option, at least for the time being.