Capitec is *****ing my money out of my accout

Capitec is taking money out of my account with no explanation why, the bank statement doesn't add up correctly and every month when I add up my money by hand, there is missing cash. When I go into the bank branch they can't offer me any explanation as to why the money is gone and where it is. I am using a bank because I want my money to be save, but the longer I bank with Capitec the more money of mine just disapeares. This month alone there is a difference on my account of - R1945. I am really feeling helpless, how can a institution that does business in this manner be allowed to continue to do their ********** business without someone stopping them. There are debit orders on the account that I never signed and never gave permission for, and the debit order simply states, early debit order, no explanation. I don't have any debts at the bank and no loans to pay off. Please someone help me.