It seems logical that the easiest attack vector for any type of cloud storage is through social engineering. You're essentially protecting potentially valuable or incriminating data behind millions of dollars worth of firewalls, encryption and other technology... or a customer service representative paid $10-15/hr, if that. Depending on how valuable the data is to you, it might be easier to just pay off a CSR, and th…
Easy. CSR has exactly the same screen as you do. With the same security questions as you have. In this case it seems, those questions were never asked. You design CSR frontend where they must themselves answer those questions before proceed. You may pay off that CSR, but she/he does not know answers to those questions so she/he can not do a thing.
If you forgot answer to those questions, alert is escalated, which needs two together CSR's + their supervisor to unlock your account + you must make Facetime call + whole process gets documented carefully.
What did I miss?