Unfair customer service from Absa

Good day I had a bad experience with absa bank that I lodged a complaint with the bank but never returned back to me with my query, I had a problem where there was an unauthorized debit order that I don't know and they debited my account while I had no funds but the bank charges me R160 per debit and I contacted them and said I dont know the people who debited my account and I need to close this account cause I cant pay for unknown debit orders ,so they said the cant close my account cause i have to pay amount of charges for unknown debit orders, till i rejected the account and they put charges every month now they say I owe them R5700 ,for their monthly charges but they are failing to resolve my problem, that's ******* from the bank i was banking from since 2007