Well my concern is that the introductory rate of your card is very misleading.
我担心的是你们银行卡的先期利率很具有误导性。
英语百科
Introductory rate
An introductory rate (also known as a teaser rate) is an interest rate charged to a customer during the initial stages of a loan. The rate, which can be as low as 0%, is not permanent and after it expires a normal or higher than normal rate will apply.