HDFC Bank — AMB charges

I opened a salary account in HDFC in 2023 because some personal issues i left my job they converted my salary account into savings account, then I started getting the mail for minimum balance maintaining, but that time I didn't had any job so how i can maintain 10k balance so gor few months it was not there but usually I user spend more than 20k average every month so on 2026 in the month of May they deducted 9k total which I hardly earned and saved in my account i thought I will not remove this balance i will keep as a minimum balance in the account. Now I am really disappointed about this. I want my money back please do help me in this.