Agricultural Bank of China has been texting me, saying that I have a credit card in our business outlets, but I have never taken it. Is it okay?

If you apply for it yourself and really don't want it, don't go. After a while, the card will automatically close (the specific time varies from bank to bank). Or you can call the Credit Card Center of Agricultural Bank of China and tell them that you are not going to activate your card, and they can cancel the account directly.

If you haven't applied for any ABC card before, your identity information may have been stolen and someone else applied in your name, but as long as you don't activate the card, it won't be activated. But you should pay more attention to whether your information is true or not.