HDFC Bank — charging of higher interest rate

Hi sir, i nalamasa Ramesh having loan ref no. 63725884.. i had a false commitment by the bank representative her name is Swetha begumpet branch opposite to shoppers stop. She promised me to provide me personal loan with 12% rate of interest.and went to agreement with the same but when the amont disbursed in my sbi account i was shocked to see that interest rate is 14% instead of 12%.. they have not informed me about this change in the interest rate, , i intially rejected this loan in case they cannot provide loan with only 12% interest. After many grievances, many visits and many hardships in 8 months also, my problem yet not resolved. They simply assigning a grievance addressable member but he is irrresponsive towards the resolving the problem, he simply escaping by giving wrong promises. Please take this case as a challenge to reduce the interest rate to actual interest rate of 12%.