Discovery Bank *****ing my money and I don't bank with them

I have discovered more than twice that Discovery Bank has been **********ly taling instalment from my Capitec account..this is still after I complained about it to say..Listen, I DON'T BANK WITH YOUR BANK so I don't know why I still have to reverse debut orders from thwm when I have nothing to do with them?it is *****ing people's money what they are doing