FNB drags heels on internal ***** using unissued card

On the 30th April my 82-year-old mother went to the FNB branch in Rosebank to report a ***** on her debit card. She had noticed 7 transactions totaling over R54k, and the available funds had been R55k. The shocking fact is that these transactions happened BEFORE this card was issued to my mother. So it is a very clear case of ***** on an unissued card, that can only happen internally. The FNB people were clearly shocked and have reported this obvious internal ***** case. Nonetheless a week later her money has not been returned and they are saying it will take 10 to 30 days from now. FNB this is 100% your fault, so why not return the funds immediately????