Citibank — Closure of credit card without intimating

Address:	560001
Website:	www.online.citibank.co.in

Hi i've taken card 1 month before, and not did a transaction, when i tried to do a transaction today in coffee shop, the card was not working, thank god ive money and other cards, if these people hav believed then today would be in trouble. When i came back and called these people(Citibank customer executive), they are saying they hav closed the card, due to some mismatch, they should do investigation before issuing a card, and that too without intimating me, they close the card. if i believed these people and went to do something big transaction would be in trouble. for thsi some action needs to be taken, otherwise i'll file a case against citibank