[Resolved]  Sbi - Loan — Arbitrary change of interest rate

I had taken loan from SBI with rate of interest at 7% p.a.
I had received one or two statements from them.
After that, they have been avoiding to send the statements stating computer problem, staff transfer, etc. as the reasons.
Recently through one of the persons who had taken the same loan at same rate of interest along with me, I came to know that they have changed the rate of interest.
While signing the agreement I had written that the loan is at 7% p.a. diminishing balance.
Is it possible for them to change the rate of interest arbitrarily without informing the concerned?
Kindly advise.