Money with draw out of my account

There was a with draw on my account the amount was 1000 rand when I was at the dam from 3:30 the vryday morning til that Saturday afternoon 17:30. The Sunday I want to go and buy dips and floaties for the following angeling competition there was no available funds in my account so I took the change and try to withdraw money I did manage to get money. But that's when o realized that there is n 1000 missing out of my account so I went to the bank and spoke to the ***** department. They didn't call me back so I went again now they tell me that I withdraw the money which is impossible because I was at the dam vryday and satarday. I want my money back. I don't care how they do it I want it back. They need to have a insurance on these sort of things. And also they told me that over that weekend there was 300 people who's money was also withdrawn. I'm going to close my account and I'm going to tell my friends and family to close their accounts at standard bank. Even I wil go to my work place and the company will close the account. And go to FNB were we know the bank will help.