There is no class (A) listed on delta's earn with miles; if you were upgraded from economy to premium you may show up now as an A but you booked into something else. You'll need to find that detailed reservation and send a request to get the miles per your original booking.
Very hard to find anything on google about VS' A class
http://v-flyer.com/toolbox_fare_codes.php?code=A would say that it doesn't exist