Corporate Travel Group is not legit.  They sell people on the premise that they have a buyer for your timeshare and even provide bogus information to prove it to you.  They then ask for a 10% deposit to secure the deal until closing.  But then they will never close it since they really never had a buyer in the first place.  They later will make an excuse on a technicality and just keep your money.  

Corporate Travel Group doesn't even have a legit address.  Look up them up as corptravelgrp.com and google map their address - you will find they don't exist there except they share the address with a one of 18 businesses in the suite C312.  They also aren't registered as a business in Hawaii.  

If someone from Corporate Travel Group calls you, call the attorney general of you state.

Corporate Travel Group in Hawaii.  Not sure if it's legit