HDFC Bank — Amb chrg incl gst

I have my salary account but I didn’t know when this become to regular saving account. I have checked one year bank statement there I could see the bank several times deducted AMB CHRG INCL GST without my consent and any notification. They didn’t even inform me how much amount I should maintain in my account. I think this is way bank are making money. I want my money back. Please refund all my amount as soon as possible otherwise I will close my account. I hope this will resolved soon.