It depends. You can reject many types of changes to your credit card account, such as an increase in many types of fees. However, you cannot reject other changes, such as an increase in the Annual Percentage Rate (APR), an increase in the required minimum payment, or a change that results from the credit union not receiving your payment within 60 days after the due date. You also will not be able to reject changes such as a suspension of your credit privileges. 

If you receive a notice that says you have the right to reject the change, the notice will give you instructions on how you can do so and the telephone number to call. 
Even if you can’t reject the change, you can still close your account if you want to avoid the change or not use your card for any more transactions.