Punjab National Bank Housing Finance [Pnbhfl] — incorrect interest rate applied

Address:

Chennai, Tamil Nadu

I took a loan in sep'17 & floating interest rate was 8.85%. I did pre-payment but tenure not reduced proper way. I got a response that rate has been increased by 0.25% intrest is 9.10
I know that 9.10% is current interest rate[protected], but[protected] again increased the intrest 9.20%. And balance tenure has been revised
Why it has been revised from 8.85% to 9.10% and then to 9.20%. Between 3month.
Kindly do something...