Wells Fargo & Company Credit Card Complaint

Wells Fargo & Company Credit card department,

APR or interest rate New Jersey

When I applied for the - - American Express Card, I was told there was an introductory APR of 0 %. This was in the Terms and Conditions. Also in the T & C is a statement that no interest will be charged if the balance is paid in full by the due date. What is the point of a 0 % APR if interest will be charged regardless? When I called the bank, from whom I received the card, they told me that that was just the way the card works, no further explanation. I made purchases with the above mentioned card, and in my second statement was billed for nearly $20.00.