Karnataka Bank — Money deducted as Ach charges without itimation

Sir
As mentioned above i have savings account in Karnataka bank K B Extn Branch Davanagere, Branch Code:190, IFSC Code: KARB0000190, MICR Code:[protected], Phone No:[protected], 262794

sir on[protected] i have received loan money from other sourse and suddenly without information amount debited as 590 for 35 times that is total
20650 . I'm kindly requesting you to please help me to refund this debited money to my account as soon as possible.