shoprite ****med me my R800

i went to shoprite money market in yeoville to transfer money when i received my Mnumber i sent it to my sister out of joburg when she went to shoprite to take out the money she find the money has been taken out. How??im the only one who knows the pin i went back and ask to see footage so i can understand what happend cos they telling me that the money was not even taken out there but another shoprite thats when i asked to take out money u need Mnumber n pin how did they get hold of it if its not the cashier who took it