Fnb block my account whitout any notification

"I am extremely disappointed with the service provided by Fnb. My account was blocked suddenly without any prior notification—neither via email nor through the app. This sudden action has caused significant disruptions in my business operations. Despite my multiple attempts to contact their support, I received no response. This lack of communication is unprofessional and unacceptable. I urge them to reopen my account as soon as possible and to clarify the reason behind this action." My money is stuck who is responsible for lose pls contect me and solve this issue