So I want to inform my internet provider of my new phone number, but I can't remember any of my login info for their web interface because I never used it. Luckily, they have a "forgot my username" function, where I submit my email address and get a confirmation that my username has been sent to me.

Yet, I just don't get said email. I try again, but no avail. So I just guess my username and use their "forgot password" form, which – hooray! – confirms it just sent my an email.

But I don't get any email. I retry, I retry after a day, but no automatic response. I remember a incident a few years back when I didn't get some automatically generated mails from a company and decide to contact their support if they could just reset my password manually.

Nearly a week passes.

Now I received the answer. I just don't have an account.

Lesson learned: Next time I'll just input garbage first to check if those forms are sane.