Very poor confidentiality Standard bank

I ha so disappointed with standard bank. My bank account was accessed by stranger without my consent. We had disagreements with women that wanted to lease my property because she wanted me to give her deed search results to prove that my property actually belonged to me. I refused to do that because I’ve never heard about that and besides I don’t have access to that application. She decided to phone standard bank and closed my account with them. She had signed the lease agreement hence she had my details. Standard bank without confirming the validity of the story, they went on and block my account. My home loan is with standard bank, they should have confirmed it to her because they already allowed her access to my account. What irritates me the most is that when I phoned them; they first they needed to perform security questions with me before they can help me otherwise they can’t if I fail the questions. So does it mean that the person that closed my account was not required to go through security questions. What kind of the bank is this?