Fraud by an ias institute

Sir, i took admission in a so called IAS institute on 21 august last year , pay ed 1st installment of 40000 rs of 120000 rs on the same day issues starting taking place after 1 month when i found that only 1 teacher was teaching all the subjects back to back, which i felt wrong nd told to the teacher then he said new teacher would come soon till then i have to study whatever he was teaching ,1 month passed and i payed another installment of 40000 thousand . it had been months now but no one came to teach and the teacher was repeating same thing over and over ,i objected but he said will will do .i paid my final installment on 21 January 2016 ,then he showed his true evil face ,he ceased to come in class on time and used to skip class at-least twice a week .some day i approached him but he started procrastinating and showed anger . whatever he taught me was irrelevant for examination nd was just a spoonful of water in the vast ocean .his mentally harassing behaviour broke me from inside after sometime i was called at home bcoz my grandfather was paralysed nd i decided to take care of him ... sir after 14 months of taking admission i want to refund my money from institute .. sir plz tell me what should i do ?