Educational Loan repayment

Respected Sir, I have got educational loan of Rs.33,000/- per year for 4years totally Rs.1,33,000/- for my BE engineering course from the City Union Bank . My father total annual income is Rs.4,35,384/-. Hence I applied for 100% Interest subsidy for the holidays period with Income certificate obtained from the Tahsildar. Now I have completed my education on June 2015.. I wish to settle my loan through OTS. I approached Branch Manager and asked to him that I am ready to settle my loan after deducting the Interest subsidy and ready settle the principal and interest after my holiday period. But the Branch Manager refused my claim and told me I dont know anything regarding interest subsidy. He issued Statement of accounts and its show heavy interest from my date of first installment. Further I have received only 32,000/- per year. But the statement shows Rs.1,33,000/- is opening Balance on the date of first installment. How it is justified ? I brought to the notice of the Head office of the bank . But they are not responding me. I sent a letter by registered post to the Branch. But reply not yet received. Hence Please guide me in this situation.