State Bank Of India [SBI] — debit of my salary account without my knowledge

Address: Sri Amarajeevi Potti Sri Ramulu Nellore, Andhra Pradesh, 524201

My name is madhava rao.P, i am working in military service since last 12 years. I brought the personnel loan in state bank of india, kavali branch(0858). I had repay the loan sicnce last two years emi of rs:10, 600. Today 03/07/2018 my salary account debited amount of rs:16000/- without to my knowledge . When i reciving debit messege, then contacted the field officer, he replaied that is intrest amt of loan from sanctioning date, you are paying only 10600, the correct emi of loan is rs:11600, " the previous field offifer wrongly fix the emi". I say that is your mistaken why are you debit my account without my knowledge, there is no answer from the officer.