Telkom debit you incorrectly

They take money from your account without authorization. They debited me for a missed debit a month later. I called their call center twice before this and no one made me aware of any charge until one day they decide to take the money out all on their own. How is this right when customers must be informed of an additional amount especially a month later. Is there anyone that can hold a big company accountable??? I dont think so, They just take advantage of less privileged people