UNAUTHORISED DEBIT ORDERS

I have a savings account with Capitec Bank. Lately, there have been many unauthorised debit orders on the account from IGA Investments. I do not have knowledge of who this people are and it seems like they have been taking money on the accounts of Capitec clients. I need Capitec to investigate this people and recover all the money that has been ****** from me. I believe the bank is the safest place where our monies are protected. I am prepared to take the matter to the relevant ombudsman if Capitec doesn't stop this ****** from doing these.