Impossible to recover signing up process

I have started the process to sign up for a new domain and I didn't get to validate the mobile number asociated to the domain.

Now I got the validation code but I can't find the page to validate it.

Besides, it's impossible to sign up again with the same data because the domains appear to be already registered and there the password I used to sign up doesn't work because the mobile number hasn't been validated.

Does somebody know how to get out of this infinite trap?

Thanks.

Nicolas.