I took a flat on rent; the agreement starting from 12th June, 2014; for a period of 11 months. It wa

I took a flat on rent; the agreement starting from 12th June, 2014; for a period of 11 months. It was agreed by both the parties that notice period of 1 month to be given in written and rent of 1 month to be deducted from security deposit while vacating the flat.

Current situation - We continued living there till 30th May 2015. Thus making it 11 months and 18 days. But our owner is deducting 1 month of rent for painting charges as well as 15 days rent as we didn't give notice period. I think the agreement is terminated by efflux of time and we should not give the extra 15 days rent. Also, what if we have paid entire 30 days rent of May 2015 month also. Should the owner deduct any amount from security deposit?

What are the legal steps that can be taken by us as tenants to prevent such injustice.