Stop removal

Hello I'm nemalale beauty a Capitec bank client, Capitec Bank closed my account when I visited the branch they told me that my account received a funds of R15000 of which did not see,so they told me to do affidavit to confirm that I don't really know about that funds and I did as they inform me,today I went to the branch for feedback they told me that my account is now closed permanently for *****ulent of I which I don't know about and that account had money I've saved on save account and I really want to use the money and they told me that I cannot get that money back..so please help me on this issue