Society Maintenance Cost Issue

Hi Experts, I am currently residing in a rented apartment in a gated society in the Bangalore city. The society have certain basic amenities like power back up, swiming pool, gym , 24 x 7 security and etc. For which a maintenance cost is paid by the residents quarterly. The maintenance cost is calculated based on square feet area of the apartment. There is a special additional maintenance cost of 3000 is charged on the apartment which is rented to bachelors. Since I am staying in a 3 bhk apartment with two of my other bachelor friends, so my apartment unit is charged additional 3000 which is named as Extra maintenance charge. There is no such additional facilities provided to bachelors in return to this cost. This is basically a very ill thought way of taking more money from individuals who happen to be bachelors. I wanted to know whether this is legal to charge someone more maintenance fee based on his/her relationship status. I am using the society facilities as much as any other family person. Regards, Priyanka Gayen