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Who performs the blocking on a Visa card?
The request to block the money is made by the Party who sells the product. Based on this request the Bank blocks the funds. Subsequently the Party who sold the product makes a charge against this block. Just to give an easy example; So in the online train booking there are multiple messages sent between the Bank and SNCF. Something has gone wrong. It looks like the message from Bank sending back the Block reference number to SNCF has not reached. So as per Bank there is a Block and as per SNCF there is no block. Keep chasing SNCF to issue a letter so that you can send it to the Bank and get the Block removed. Typically the Blocks by the Bank are for a period of 30 days and if there is no charge against that block it automatically gets reversed.