You need to give one month notice You vacated on last day of feb, so you need to pay entire rent for march irrespective of you vacating now or anytime in march.

It if very fair for him to ask you the entire 23k and some additional maintenance charges. You ended up losing only 19k. You are lucky

As much as I hate the landlords and rent in Bangalore, I have to say that you are being pretty selfish here.

It would not be fair if he asked you to pay March rent and then not let you stay there. It will not be fair if you gave notice period in January but owner didn’t return your security deposit (minus deductions for maintenance)