Hi, I came into this late, but thought I'd shre my experiences with DJ and 'route changes'
A couple of years ago my wife & I booked a trip home (to New Zealand) from Canberra. We originally booked on DJ to SYD and then to WLG return
DJ cancelled thier service to CBR and we were re-booked on REX (who I found to be great, and it was a pity when they pulled out of the CBR-SYD route)
Rex cancelled their services the day after we left on our holiday, and they arranged for us to return on QF
Virgin then told us a few weeks out that the flight we were booked on to WLG had been cancelled, and offered us a refund, which I declined (this was a Christmas break, so no comparable fares on QF or NZ, as we had beooked in April), and made some vague threats about never using them again, and they came back with another offer, of changed routing and/or days, at their cost, with some talk of additional travel vouchers. (I had already booked internal flights in NZ with NZ, so had a vested interest in keeping as close as I could to the original plan). DJ offered to get us to CHC on the same day as original, and NZ agreed to change our flights so we could depart CHC instead of WLG with only a rebooking fee. We were set, until the week before we left...
As Rex had stopped flying after our depature, we had been put on QF from SYD to CBR.
When I rechecked our return flight, (also out of CHC, part of the original deal), I found it had been subject to a time change, and was scheduled to leave 90 minutes later, creating a real posibility that we would miss our QF Flight. I had a 'friendly', and somewhat one sided, chat with various members of the DJ customer service centre, and eventually secured a re-routing to MEL, and then on to CBR with DJ. The person at DJ also arranged for our QF flights to be credited, so we could use them later on.
As I think, at the end of the day we got something that worked for us (we have family in CHC, so we got to see them twice)
As a result of this, we have continued to fly with DJ (as my wife prefers their service to QF, which we only fly with for business)
So, it would appear to me that you have 2 choices, meekly take it, which is the first option they offer, or request a rethink, in which case you can negotiate a better solution
YZ