ICICI Bank — Deducting QAB charge without knowing

Dear Sir,
I am having Senior Citizen ordinary SB A/c in ICICI Bank, Besant Nagar Branch, Chennai-600090. My A/c No is[protected]. When I checked my SB A/c status with the branch on 25.1.2012, they informed me that it is silver Account and I have to maintain minimum balance of Rs 25000/- for avoiding penalty. This was a shock to me since I had never asked for any Silver A/c. The branch pesonnel are telling me that computer will automatically update the satus based on previous balance history.This is atrocious since I may be levied penaly at any time for lack of sufficient balance since I am operating it only as ordinary SB A/c all the time. I have now applied for change of status without any assurance for protection of my interest.
Public are cautioned in their dealings with ICICI Bank.
Sukumar