Need some advice here... Had a ticket to YYC from DEN. Volunteered twice. Was needed twice. The third flight they put me on was cancelled. Couldn't be rebooked until tomorrow PM so I said hey, I've got an idea, I have a ticket to EWR why don't we use that to get to EWR and then make the other ticket to YYC on AC from EWR, it will get me in 12 hours earlier. The agent agreed but when rebooking me, he put my EWR reservation on the YYC ticket. I pointed this out to the elite line who told me to see the GA on the EWR flight but she said she couldn't exchange the ticket for some reason so I had to get on or get left behind. I landed in EWR with no AC Rez AND no coupons left. EWR is home for me so I just went to sleep after getting nowhere with an SD, although my record was documented. Other info: it's 005 stock but UA rebooking the YYC ticket turned it into 016 stock. The EWR ticket was a 99 dollar L fare, the YYC was a 750 dollar B fare. I wanted to know if any of these are feasible A) get a refund on the YYC ticket as it was refundable and somehow get them to acknowledge that in reality I just used the EWR ticket and the person in Denver messed up. B) get to fly to YYC by reissuing the coupons C) write in and try to get a flight credit roughly equal to the value of the ticket as a goodwill gesture or something of that nature. D) dispute the charge with my cc company. Also, do I deal with UA as they did the rebooking or CO as they are who I paid?