Investigation too slow.

My account has been invaded on the 15th of August 2019. I came to realised this on the 16th August when i tried to withdraw money from an ATM but i couldn't get money from the ATM. After few attempts of trying to withdraw cash from the atm, i decided to print a slip, i found the there was an overdraft facility of R24000 that was added to my profile that i was not even aware and also i found out that my mobile number was also blocked. The next day i decide to visit the branch, they showed me that my credit card limit was also increased from R15000 to R43000 and they were lot of movements from my credit card, cheque account and the overdraft facility. i went back to FNB on a Monday and they told me to open a case with the police station and the bank assigned a investigator to check what transpired. The bank provided me with reference no: 937942. I have submitted all the documents that they bank asked me for, this includes the bank statements for cheque account and credit card, case number from the police, the phishing email and the forms i was requested to complete. with all that information that they requested and was submitted, it has been quiet,i have tried to contact the investigator a couple of times but most of the time she is not answering. i managed get hold of her on the 9th and she told me that she was going to give me feedback by the end of the week last week that never happen. i am not trying to be spiteful or anything but i would like FNB to get down to the bottom of this case and get this resolved so that we can all move on. Thank you