State Bank Of India [SBI] — unauthorized emi deduction

Address: Kanyakumari, Tamil Nadu, 629001

Sub:- discrepancy in car loan deduction - reg
Ref:- 1. Car loan a/c no. [protected]
2. Sb a/c no. [protected] &
3. Sb a/c no. [protected] with sbi chemmanvilai 9589

My above car loan was taken from the then sbt personal banking branch nagercoil branch code 70686 by dec. 2014 and is paying the emi rs. 12000/-well before the due date.
Nowadays after the merging of sbt with sbi, whenever i deposit money in either of the two sb accounts mentioned above, rs. 12000 is being deducted for which i had to visit the bank and get reversal of funds.
The unwarranted deduction of money from my sb accounts cause me great difficulty in managing my daily affais. The banking experience is becoming a night mare for me.
Kindly solve the solution and help me have a peaceful and cordial relation with sbi.