Sir

I had bought a bluetooth on line from paytmmal in the cost of Rs.279/-. Due to sending of defective item, I returned the product for demanding to return of my amount. I had returned the product. Tomorrow, I searched online for contacting the paytmmall, one mobile no.********50 was showed in the paytmmall list. I contacted him for my payment. He asked my debit card no. and I told him the debit card no. But after some time, I saw an amount of Rs.5279/- has deducted from my account in the above mobile no. against Airtel Money banking. Now, what shall I do? and how can I get the respective amount?

Please help me for the same and refund the above amount to my account.