If PDFSmart charged you more after a payment failed, check your account profile to make sure you are still on the same subscription plan.
Having pictures of the plan and bill will help if you try to bill someone and fail. Sometimes, the failed attempt is carried over to a different rate or repeat period.
Next, use PDFSmart's help form or email [email protected] to tell them about the difference between the plan they advertised and the amount they charged you. Make it clear that you want a refund or a change to the right rate.
If they don't fix the problem or say no to your request, you should call your bank or card issuer right away to challenge the charge.
Show proof that the bill didn't match the offer you agreed to. This will help your case for getting the higher payment reversed.
If the issue persists, share your experience and consider filing a complaint on Xolvie to seek a resolution.