The company with which I have a SIM contract informed me that my credit card was not working. So I was inquiring with my credit card company via my online bank.

They said to me,

"When we checked the status of the card, we were informed that the customer's debit card information may have been traded on a black site"

"In order to prevent fraudulent use of the card, we have stopped the online payment of the card, so it seems that the payment could not be made"

In the meantime, I checked my past history and found no evidence of unauthorized use, so I am relieved.

And I'm sure the credit card company will be "fine" with this, however I came to think that,

"What if they suddenly deactivate my card without contacting me?"

If my credit card had been suspended while I was on an overseas business trip, I would have panicked.

I think, "I should be careful," but I don't really know what and how to be careful about.

Anyway, I went through the process of reissuing the card and contacted the SIM company about it.

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By the way, all of the above exchanges were in "chat".

As a rule, online banks do not provide telephone support for consultations (including complaints).

It really was a world of 'if you can't chat in real time on your phone/PC, you are not wanted'

However, there is a certain amount of anxiety associated with a contact system where we cannot make requests or complaints aloud to a real person.

On the other hand, for what it's worth, online banking is convenient, so I think,

-- I wonder if society (the masses) will eventually respond to it (chat and chatbots)?

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Although there seems to be some trouble, I realized that the GIGA school concept is an essential education for children to live by.

So, I think the behavior of us will be this way, as seniors.