How much do you have available for down payment? If it is 20% or more, than you can actually get up to 35 years amortization in some cases.
It doesn't sound like you are being given accurate information. I have never seen CMHC decline a particular file because it is already in the system with another lender, nor have I heard of a case where where another submission has made your original approval null and void.
_________________
Paul Meredith
Mortgage Broker
CityCan Financial (est 1976)
416-409-8009
http://www.easy123mortgage.capaulm@citycan.comLic#10532
Follow me on Twitter!
http://www.twitter.com/paulmeredith