be careful when buying expensive items by using credit card

Yesterday I was going to buy fairly expensive item on the internet,
When I entered credit card number, next screen was error page which display “you can’t use this card!”.

I checked limit amount, But It was enough to buy it.
I tried to buy it by another credit card, but it also failed.

Today , I got a phone call from the credit card company,
The operator told me that yesterday’s purchase was not considered to be normal. so their system locked my credit card.
The company called me to confirm that this purchase was done by me.
also they unlocked my credit card status.

Getting reserved seat of Shinkansen

I usually use Eki-net which offer up-to 35% discount ticket.

This time I was going to take one ticket on 12/31 From saitama to Niigata,
but this period is called “kisei-rasshu” which means many people return to their home.

Today,I got an e-mail which said that I could not get ticket.
So, I searched another train which departs late afternoon.

Finally, I could get a ticket for 15% discount price!