Make a note of the reference # which you get after making a credit card payment. call the bank on Monday and provide the reference # they will be able to release the block. Also check if some one tried to make a transaction on your card from the time it was blocked. If you from India and if you are holding a bank a/c of xyz bank and credit card of xyz bank which is blocked you can make payment thru ur bank a/c and the block will be released within 24hrs some times it happens automatically.