See my friend, Leave is your right. This right has the following point of origination :-
1) Your Contract or Organization rules
2) Shops and Establishment Act
3) Factories Act or Minimum Wages Act.
If you get your leave from contract you can enforce it. If they do not allow you such use, that will be breach of contract as leave is a material aspect of contract of employment. You can set aside the contract and walk out of the job. Also claim damage along with compensation.
Now if you are covered in any of the above act, which you can see in website below. You can as a matter of right go on a leave and the employer will not be in a position to terminate you or take any action like deducting wages.
Or simply cite the laws to your employer and ask him to pay you wages + compensation as settlement towards loss of leisure, in case leave lapses.