Vodafone India — regarding refund of recharge amount done through my vodafone app

i am glad that vodafone customer care, his number is [protected], his true caller name is guri.he called me and said that he will refund my money to my bank.i felt so happy but this fellow is asking my debitcard number, card valid date, and cvv number..rather than having my account number...when i refused to say my card details he just hang up the call. please i beg u all dont tell ur card details to anyone who ever it is