cashier in the store use my account

I went to pay my account on 20 November 2015 at Foshini Alberton but I don't understand how did the cashier could give me my bank card without my store card. On the 24 November I went to the store to collect my card as the Alberton store called that I left my card. When I requested for my card they suggested to make a new card quickly without even looking for my card. After receiving the new card I requested for cashier to check my last purchased. She told me I have purchased on 21 November 2015 for R752.99, which is not true as I was at a funeral in Limpopo and the transaction took place at Alberton store. I have lay my complain to Foshini customer service on 24 November 2015 until today they have never came back to me. I went to the Alberton Store for follow up but the branch manger said she is to busy to come and see me and send the cashier to assist. Every week I am calling customer service for update all what they can tell me is that they are working on the case and will come back to me. The feedback I receive last week is that the cashier who I paid my account to him is the same person who use my card and made the unknown sale. why is it taking so long for a internal case?