OP is booked in coach and asking how much to upgrade to a higher booking class. VS does not have a Economy Delight/Comfort+ award level and the next step up would be a Premium Economy/Premium Select award. Ultimately, OP will need to go through VS (not DL) since VS points were used and it will likely require an exchange of tickets and paying up to whatever they are currently charging for Premium award (and would require availability of award space).