Maybe your credit card was processed at Bank of China.

If it is not handled at Bank of China, since many of the bank's businesses require customer resources, such as loans, insurance, financial investments, etc., it will call potential users to ask if they have needs. If so, they will Guide them to do it. Calling is a marketing tool.

Generally, banks will call you to apply for a credit card, repay a loan when it is due, recommend a business, etc. It is recommended that you handle it according to your own needs and not to be tricked.