I have FitDay Premium - I really enjoy it and would recommend it.
When I entered my information (a year ago or so) it took my credit card just fine, and I've had zero problems with any sort of fraud. Maybe the credit system was down at the time, or there was some sort of issue.
I also always get emails back in response to any questions I have sent in. They have a couple different emails, so I would make sure you're sending them to the correct location.
Hope it worked out for you!