ABSOLUTELY USELESS CALL CENTRE AGENTS( not all but...)

I got a notification of possible hacking being done my SIM. Someone did a sim swap to acquire my details and transferred money from my savings account to my cheque account. As soon as I was aware, I immediately called the Standard Bank call centre to block any transactions to and from my account. The call centre agent ASSURED me that my account was blocked and I let my guard down because I trusted him and the bank. To my disappointment, nothing was blocked. ALL of my HARD EARNED money was gone due to negligence and sheer ignorance. I am disappointed in him. Why do we even keep our money in banks if this is going to happen?!