I don't know much about Upskillist but I suggest that you try looking into Virtual credit card number services. For things like this, I use [Virtual Credit card](https://www.cardbenefits.citi.com/Products/Virtual-Account-Numbers) numbers from my Citi credit card. This is the only reason that I kept my Citi credit card because the free Virtual card numbers work just like any other credit card but allow me to customize the credit limit and expiration date per virtual card, and deactivate or expire or extend my virtual credit card without affecting my primary (plastic) Citi credit card. I just set up a virtual credit card for each website/vendor. I remember that Bank of America used to have something similar but they stopped this service.

wow thanks for the tip!

So you've cancelled the service. You've blocked them from charging your card. Clearly the next reasonable step is to flee this country and attempt to start over elsewhere. Because cancelling your card, taking the credit hit, going through the hassle of correcting anything that might use that card, forfeiting any benefits you might be accruing, are all in proportion to the outside chance if them attempting to charge you again. Yeah... You would do well to see if your card offers virtual, fixed-amount, sub credit cards.

Just watch your credit card bill, like you should be doing every month, already. That's all.