Is this urgent? New Year is almost near and I'm afraid that the banks may be closed. Still, I suggest you try calling them, message them on their app, or email them about your concern. Better yet, just drop by after the holidays and personally talk to them so that you can personally take care of the important details. 

If you want to do it through their representatives, you can call 1 833-885-8259.

Hi Armand. Go to Lucky Mobile selfserve page to update your credit card info. You can also do it if on the Lucky Mobile app.