Credit cards basics

How does a medical credit card work?

I want to sue the card issuer that issued my credit card, but they tell me I have to use arbitration. Is that right?

Am I responsible for charges on a joint credit card account if I didn’t make them?

Can my credit card issuer reduce my credit limit?

Why did my credit card issuer increase my late payment fee?

What do I do if I think there may be additional unauthorized charges made after I reported my credit card lost or stolen?

Why do I receive so many offers for new credit cards in the mail?

How does my credit card company calculate the amount of interest I owe?

Can a credit card company charge me interest after I close my account?

My bill shows the amount of interest I have paid for the entire year. What's that about?