It is safe to cancel at the counter or by phone. The third party doesn't know your card number or what bank you are, but it is recommended not to set the same password. If you are worried about remembering passwords, you can change the order and arrangement of passwords, or modify the mantissa and the first digit of the same password. If you are worried about security, you can go to the bank to change your password. Generally, there will be no problems under normal circumstances.