Myntra.com — Fraud transaction on SBI card

Website:

Myntra.com

I am an simple house wife, my name is Sudipa Karmakar, my regisetered phone no, is [protected], on 29/9/2015 a unknown phone call came from[protected] and told me that he call from Myntra.com so believe on him, then told me that the product which I have to return and refund will be done on few days. for that I have to give him my 16 digit debit card no.of State Bank of India, at first I refused to give. but reatedly he convinced me for that . then I gave him the no. because he told me he call from Myntra.com there is no fear. etc. then he ask me some OTP numbers which I received as SMS . I dont know what is OTP no.is. So I gave those no, also. And then I realised that I was cheated by someone. After that some sms come from my bank that Thank you for using the debit card etc. My Rs.22000 was gone from my account of SBI. to ATOM, PAY U, MOBIKWIK. Please do something for me . who cheated me, I am a layman.Plz help me . thanking you Sudipa Karmakar.