Left BPO Without Informing.'

I joined a BPO on 16th September 2015 and left on 6th October 2015? Now they are asking for recovery of Rs 8500. WHAT IF I DON'T PAY THE AMOUNT? I LEFT THAT BPO DUE TO WORK PRESSURE. Can they take legal action against me? If i don't pay recovery amount.
They did not give any salary to me, because i worked only for 20 days. And in my offer latter it is mentioned that i have to pay 1 month salary to company, if i leave the company without giving notice period of 15 days.

Aswathi33 - Difficult to state if company will or will not take further action; enforceable under contract law but difficult since read in conjunction with labor law and applicable labor law of state. Recommend letter to HR asking them to deduct from 20 days of pay and let you know the balance - that should be a far lesser amount and payable.

Please let us know the content of the recovery letter send to you asking Rs. 8500/-, is it for the 10 days notice period which is short or anything else they are demanding, to give an appropriate view.