I talked to Mount Snow with this same issue and they indicated that until you get your refund, your peak pass will still be active. So congrats you now own two season passes! Doesnt it feel great!? (Coming from someone still waiting on my refunds from an Oct 23 upgrade date)
I ended up with one Okemo pass and three Epic passes last season. Very efficient. First Epic was at the resort on the first day, other two came in the mail a few weeks apart.