Tata Docomo — Docomo postpaid bill payment

I had complained against an online payment not being credited against post paid bill. Immediately i received a call back from docomo saying that my payment of 578 would be refunded back as there was some problem with billing. The phone number is [protected]. The person askd for the card number along with otp number which was disclosed. Now my account is showing a debit card purchase of 578. The original payment is still not traced. I have lost another 578. And again another withdrawal of 1500 is shown.