GitHub Stores Deleted Credit Cards

Recently I noticed the following expenses in my credit card expense details:

I saw GitHub charged $7, $7 for two months, and $4 this month. This made me question why it started to charge because I remember a few years ago I gave my credit card to Github to work on private repositories (back then it was not free), then decided not to go with them.

I also remember I deleted my credit card from GitHub, but I thought I may forgot to delete, so I log in to my GitHub account to check.

As you saw I don’t have any billing information other than $0 which is a good indicator for me:

I checked my payment methods, but there is no payment method. This proves I deleted my credit card:

Then how GitHub charges my card if I don’t have a card there? It’s odd. I also checked my payment history data:

Even if I don’t have a payment method there, if I am being charged, I’d like to see the billing history, I guess everyone would like this to happen.

So my questions to Github are:

1. Why GitHub keeps the deleted credit card information? Is it even legal?
2. Why Github continue to charge if I don’t have a payment method set there?
3. Why GitHub doesn’t show my payment history if it charges correctly for months?
4. How can I get a full refund and delete my credit card information from GitHub?

I love GitHub and its products, use them daily and all my repositories are there. I hope this problem resolves quickly and I advise you to check your credit card if you also deleted your credit card from them in the past.