My problem:

1) Booked VS metal with a Delta phone agent 10 months ago, don't recall if it was originally with DL or VS flight number. Immediately applied GUC and cleared into G.
2) Able to select UpperClass seats via VS site. Called VS and they confirm I'm in UpperClass.
3) DL subsequently re-coded Virgin Premium Economy as G, sometime in April.
4) DL site, DL DM desk, DL Twitter now inform me I'm in Premium Economy.
5) VS still says I'm in Upper Class.
6) Flight has VS flight number. But to the best of my knowledge, DL handles VS flights at JFK. So risk is DL will insist I'm in Premium Economy.

Thoughts?