Again I am Double Debited without Consent

This is the second time within a 4 month period that Nedbank has Double debited my account without my consent.<br> i am absolutely livid, i must fall behind on other payments in incur bank charges because they feel they have the right to just take money from me as they please. <br> I cant even get it resolved when i call the call centre they throw me from one department to the next,<br> i need this to be resolved ASAP. This is unacceptable.