ICICI Bank — Spelling mistake in surname

Address:

Pune, Maharashtra, 412101

I have an bank account with icici bank from last 17 years and i have requested for correction of spelling in my surname but the bank staff has refused to do correction and suggested for new account opening or get an correction in gazette, how can i get gazette correction when the mistake is done by bank, they are not ready to check for their own mistake with my original form.
Now since i have linked this account with many other services it will be very difficult to change and executive are not able to understand the mistake done by their back end team. I have all my documents with correct surname and also other product offered by icici bank has correct surname using this bank details.

Appreciate if some can arrange for resolution.

Thanks