Fee structure decreased

Location/place: mumbai

Name of company/service: climb first

I had taken the admission for my bank classes by paying Rs 8000 to the climb first coaching classes.The classes here at climb first are conducted regularly and we are taught nicely.
Two days back the climb first coaching classes changed their bank course fee from Rs8000 to Rs 7000 ..Now i have demanded for the rs 1000 extra amount that i had paid at the starting to the climb first. But they are now refusing me to give the additional amount. I feel cheated…