you rental agreement is for 11 months .ie till 1-05-2016
2) on expiry of agreement you should have vacated the flat
3) was any extension granted by landlord in writing ?
4) since agreement ahs expired there is no question of issue of 2 months notice period . had you terminated agreement during notice period 2 months notice would be required
5) refuse to pay for 2 months notice period .
6) landlord cannot adjust 2 months notice rent from your SD without your consent
7) you can sue landlord to recover money wrongly deducted