I don't think you send the hand to Merge, but to the skin you got it on.
When I hit my first RF, I was instructed by RPMJon in live chat to send hh to
Manager@rpmpoker.eu to get my bonus which they paid out w/in 48hrs.
Anyway, nothing in those above terms says that the hand must go to showdown or that any players in the hand must not fold before the river is dealt. Either the rep doesn't know what the f they're talking about or they think you are stupit and trying to hose you.
Just re-email them quoting their terms and conditions for that promo. Maybe they are getting it mixed up with the bad beat jackpot or something.