Sixty60 app flaws

I love this app and service but there are two flaws. One, no-one ever answers the phone and two, when the credit or debit card on the app is changed by the bank (this happens when the card expires), the three digit security number changes. However, the app does not allow this change. So payments do not go through. I have reloaded the app as well as my cards a few times but it does not work. Payments are refused. I have now used the PnP app every time my payment does not go through