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hi, we encountered the same problems as yourselves last summer.
It turned out the credit card company had deemed the transaction as "suspicious" and blocked our card.. This was after we had purchased our roaming wifi and pre-paid for a hotel for the night in Tokyo.
Because it happened late in the evening, the department I had to speak to were shut until Monday morning( a 9-5 team), so nobody had contacted me, to say, we've blocked your purchase and the general query line was not able to help me.
Anyway in the morning, matter was resolved in 5 minutes, they were very apologetic and asked if we had incurred any costs because of it, so hats of to them for that. I think their excuse was, we see a lot of fraud being made in Tokyo on UK based cards? So i would contact the credit card company and check with them.
We then went and got another credit card to use on the holiday as insurance, incase anything got declined whilst in Japan.