Poor service

I have a home loan with FNB, I have for the past three months had an extremely difficult time with service! I called, and get put through from one person to another, with no help from anyone, only for the call to be cut off, so next port of call is to email, and not receive a reply to the email. So now I go into the branch to seek assistance, only to be put through to home-loans, with the person answering the phone also not able to assist, only to hear, I will forward your query, which takes a week to receive a reply, and the reply still has not answered my query! I am really shocked at the poor service received,but today I was gobsmacked at the shear incompetence or lack of interest or just don't care, when I received an email with another customers homeloan statements for a period of a year, 6 statements with no encryption, so I have been given access to someone else's confidential business! My question to FNB today is who are you sending my confidential business to, if it is possible for you to send others confidential business to me! Really not good!