So, you caught me red-handed. Truth is, that this is really a post for my own benefit as I always seem to lose this link and then spend hours looking for it!
Basically, if you want help with Facebook Advertising Billing or Payments, then you can use the following link:
https://www.facebook.com/help/contact/649167531904667
Not sure if this will help you if your account is disabled. If that is the case, then you will probably find a link to contact Facebook above your ads manager.