If you think TopPDF got your card information after you started a free trial, the first thing you should do is change your TopPDF account password and turn on any security features that are available, such as two-factor authentication.
Their User Agreement says that you are responsible for keeping your account safe and that you must tell them right away if someone else gets into it without your permission.
Next, you should call your card provider or bank and ask them to stop any further payments to TopPDF.
This is because the service's Subscription Terms say that once you give payment information, you agree to recurring charges.
If you’re struggling with a similar issue, you’re not alone. Share your concerns or file a complaint on Xolvie to connect with others and find support.