After Citibank ignored many requests to fix a bug that would not allow me to register my phone number for my credit card, I tweeted. I was immediately contact

After Citibank ignored many requests to fix a bug that would not allow me to register my phone number for my credit card, I tweeted. I was immediately contacted by their social media customer support team. They then phoned me to arrange the change. I told them off for bypassing security, but I was pretty confident it was them and did not give them any private info. But if you insist on the bank acting securely, your life will be even more of a hassle. Note that in this case they had ignored my normal messages, so if I brushed off this call, most likely I would make no progress at all.