Deutsche Bank — Great world vacation offer from DB fraud

Last month DB(Deutsche Bank) executive has called me and told me of an unbelievable World Tour Offer. Saying that I just need to pay an amount of 6764 Rs. for 5 days and 4 nights. He said i was one amongst the 43 customers exclusively shortlisted for this offer. And the offer is absolutely free. Because of this i misunderstood the offer.

They have already charged me for this without even sending the documents.
How can someone charge the amount direclty just I was talking to executive for more than half an hour.
When I told about this complain they told you approved for cash deduction from executive call only..
It is big fraud. after that I thought who argue for 6k .Then without having any option I have to continue with them..

When they sent me the kit .I had even not saw that voucher .Still I thought I only misplaced the voucher but Now I asked them so many times to reissue my voucher But they spoke to me very rudely and said we can't help you .. I m requesting them too reissue my voucher or pay my money back .. But they are only intrested in talking some one money without giving any services..
I am really frustated..
pls tell me what to do I have paid my entire amount of credit card I have proof also . If you need any details from me pls let me know..