Theft that is unexplained by the bank and deactivation of my banking app without authority

I have been banking with absa for quite some time and i have a savings account with them that has no debit orders on but they decided to block my online banking and my app a few months ago without my authorization and i did not worry much about it because its only R1500 that gets deposited monthly there and its my daughters allowance and twice now they just take R1000 from that R1500 and i do not even get a notification when that happens and they never returned my money on account ***. The last incident of the R1000 theft was between 2023-05-31 and 2023-06-01. It does not even appear where they took the money to. I never give my card to anybody or the pin or even my cellphone for that matter