Nedbank *****

On the 29 someone transfer R400 from my Nedbank account using Send Money ....then he called me acting as if he sent money to me by mistake...but likey enough i managed to see that it a **** so i went to the nearest bank they reverse my money and i changed the pin...So again on 20 of april i got a call from Nedbank call center this guy asked me about my credit card like the question he was asking didn't make sense few hours later someone hack onto my account and transfer R1400 from my credit card using send money ...they transfer this money to one of my contact then they called him and ask for a pin..so i want this to be investigated beacase i believe it an inside job...Can Nedbank please investigate this because i think someone have access to my banking app..