I checked your account,your Export PDF subscription has been confirmed and you can use it.
As you said,you are unable to convert PDF document to a Word file.
May I know is it showing any error while you are doing so?
Please let me know the exact workflow you are following.
A screenshot will be most helpful.
The system continues to ask to purchase what I've already paid for.
I enter the file for conversion and the "convert" button does not convert