How credible are Nedbank ***** Investigators?

I had logged a complaint with Nedbank 9n the 15th December 2018 for R4 000 withdrawn from my account and later finding out my card was ******. The

Nedbank then opened a ***** case and advise that they will investigate. They then sent me a final ***** investigation report that was full of Flaws! Their ***** administrator sent a report full of errors. From the case number being different, the report date as 31 June 2018 which was a WOW!!! I wonder how did they investigate my case 6months before it occurred (it is the first time I find out that June has 31 days). There is also someone else's card number there (leaked to me) if they can leak someone else's card number why would they not leak my pin?? Nedbank needs to explain this to me. Your ***** department, how does it conduct their investigations?? What was on the report was NOTHING basically!! All they did was to put their terms and conditions. No details as to what pin exactly was used, how my card was lost since I last used it while depositing at their "secure" Atms right outside the branches and which atm exactly my money was withdrawn from? I need to understand first why I was sent such a report? Why they haven't given me a thorough investigation?