Canara Bank — reversal of amount debited my saving account no.[protected]

An educational loan “vidya sagar” scheme (Loan a/c. No[protected] was taken from amhara iit branch code 006244.
Recently i observed an amount of rs.2793.00/- was charged to my saving bank a/c. (No.[protected] as interest charges towards the education loan. Currently the balance in savings account is rs.-2405.00 (Negative)
Under the education loan “vidya sagar” scheme the interest shall be fully subsided by the central government of india for the moratorium period (I. E during the course period plus one year).
The amount charged needs to reverse along with the amount already deducted rs387.00/- from my saving account account (No[protected]
I had conversation with branch manager on this matter, who stated the reversal of the amount is not allowed/permitted by bank operating system/computer software.
Kindly look into the matter on as soon as possible basis.
For any further communication please feel free to communicate with me directly. Particulars are provided below:
Mail id : [protected]@gmail.com