Capitec blocked my account

My account got blocked or the 1st of October because someone sent money to my account and reported it as *****.. No one informed me that my account would be frozen I've been going to the Maponya branch and they keep giving me information in pieces.. I was told to write am affidavit staying what happened, and that I'm allowing them to transfer the money back into the account of the unknown person.. They took that amount of R1500 in my account and when I went to the branch I was told I'm still being investigated... How am I being still investigated when they took the money out of my account?? Without getting a notification stating money was taken out???