Generally don't believe this easily, unless you can be sure that these people are from the bank (they suddenly attacked in order to complete the task).

Otherwise, these people either charge a hard fee for handling credit cards, or don't handle credit cards for customers and sell their information to make money.

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Please handle it through formal channels. My two credit cards are handled through formal channels.

No other fees (no bank card fee, no annual fee for spending 6 cards).