Absa Admin Charge over R600

I am a dad with 2 kids , I get a minimal salary for dec to get my kids presents and food, absa has taken R642 off my account for an admin charge on top of my R109 month acc fee , I dont know how I could possibly owe over R600.on my account , if this is not reversed in the next 7 days I am closing my account with Absa and moviving to a bank that care abouts its clients, this is a terribly high charge for any account , i dont even have a debit order for such a high amount , and strangly you dont get an sms notification for the charge , but all other charges come off the accont ? Wierd !!!!