my bank card was detained and money was ******

i went to an ATM to deposit money using my card outside the nedbank branch in park central the machine detained my card and i quickly went inside the branch to report this matter but i was no attended to immediately i was to told to wait after 15 minutes of waiting the assistant told me he will block the card and open a new account with a new card then all the money that was in the previous account will be transferred to the new one.after all of this took place i went to deposit money again and found out that a sum of R 1,500 have been withdrawn from my account,i ask for feather investigation and the response i get i was not happy.i was told i cant get the money back because my card was used to make all this transactions.