suncoast holiday phone scam. called and convince u to buy package travel discount and not give u any time to consider Internet

suncoast holiday called me all the way from the states. they said tampa florida.. i am in Singapore by the way.. they wanted to sell me a package deal, and i thought it was a good deal. 998 USD to go to orlando, fort lauderdale and a bahama cruise. for 4 people! great deal huh? they would not pay for air fare but promised to get it at a 60% DISCOUNT~!  

i was uncertain but i din want to lose this chance.. before i know it, she was asking me for my card details. and claimed that it was safe as i only gave the details on the front. they said that if i did not give them the 3 digit number on the back, it would be safe.

little did i know that they could charge me the amount just using my expiry date..

it is extremely difficult for me to contact them from singapore and i am having difficulty.. the amount i checked has already been charged to my account and my credit card says i cant block the transaction at all.. i need to get the company to refund me the money..

please help me..