House Owner — asking additional amount for vacating with in year

Address:

Flat no 102, Subhadra Nilayam, Sri lakshmi nagar, 500011

I am subrahmanyam, staying in flat no 102, subhadra nilayam and paying rent of rs.11500/- per month. At the time of entering this house i paid rs.23000/- as advance. Every month i have been paying rent through online only. Now i am going for another house with low rent. Its already 8 months completed. I informed to the house owner mr. Rama chandram that i am vacating the house by march month end on 1st of march only. He accepted that also. After two days he called me asking for this month rent. I said there is already one month advance with you. But he is telling vacating within one year he will not give one month rent. There is no any rental agreement also with us. He never informed me about this. His contact number [protected].