a) Is there any other option to go to court IF he cuts of the electricity (assuming I don't pay the maintenance charges)?
You can approach court of law with a permanent injunction suit agaisnt him restraining him from indulging in such undesirable activities which hamper the daily and routine life as well s peaceful occupation.
Besides yo can even lodge a criminal complaint with the police for the atrocities by the landlord.
b) Is there any way to stop him from cutting electricity supply? Letter or something that can act as deterrent? Or it is not recommended as it will anger him even more?
Approaching court with a suit for permanent injunction may fetch you relief.
c) There are murmurs in the mall that the landlord told his employees to temporarily block the way to my rented property using waste wood (that is there in the basement of the mall). I told supervisor not to do it or I will take police action. He has not done it till now.
Nobody can block your way.
a) Can they remove/evict me from property by simply giving me a notice with some waiting period? (I've invested huge amount of money in the office – rent of 5 years).
The landlord cannot any such act on his own, he has to approach court of follow due process of law to evict you.
3. Landlord is not giving me electricity bill on purpose. He is saying to first clear the pending maintenance charges. For last month, he refused to take rent cheque. I transferred the money to his bank account than.
If the landlord is not giving the bill you may approach the department and pay the bills directly.
You can continue to pay the rental amount through bank transfer also.