How much is the lawyer fee for a simple Probate case

Hello! I have a case in Patiala House District Court in New Delhi which the lawyer initially agreed to charge Rs 75,000 as the fee. Basically there is a locker that is under my parents name. My Mum has since deceased and I am trying to get it operated so I can get the contents out and bring it to my father who is unable to travel overseas and operate. We live abroad. The locker requirements mentioned "any person singly" to operate the locker however the bank did not allow it despite my Dad giving me the power of attorney to operate. The lawyer has now put this as a case for legal heir rather than contesting the bank's interpretation of "any person singly". As a legal heir case, I have now got the valuation done for the contents in the locker and will cost court fee on top. I wanted to find out how much is the standard fee to get these kind of cases sorted as I am looking to change my lawyer. Note, the lawyer has now doubled his fee without providing any evidence/receipts for expenses that he has incurred. According to him he has charged me Rs 10,000 for every bank visit - which I think is ridiculous! You advice will be greatly appreciated. Jigyasa