Dual is not wrong, as it is TWO teams wrestling against each other to determine the outcome of a/the match.
I coach and it is listed as Dual Meet on the schedule (as it always has been). Dual tournaments are also included (I haven't seen anything on track or flow as duel meet tournaments, either.
Here's an event completed earlier this month:
NWCA/USMC Multi-Division National Dual Meet Championships
Duel by definition isn't technically incorrect, but it is more-or-less the mouth-breather way of stating Dual Meet.