unauthorized being taken out of my account

Capitec has taken direct debits out of my account 3 times within the past 2days everytime the call centre agents reverse the payment the system automatically takes the funds again. I'm also being charged R45.10 for overdue payments. these direct debits are unauthorised and are only due to go off on the 1 JAN 2019 so the overdue fees are not valid but the agents refuse to reverse the payments. I'm so frustrated trying to get this resolved every time the funds get taken out of my account is costing me a fortune in call charges cause the agents place my call on hold for at least 10mins at a time.