May (I think) of Tsuen Wan

Me: "Hi. Is QR815 (HKG-DOH) for XX/15 for two passengers in U available?"
May: "It is. We can't hold QR."
Me: "I understand. I have two OW ticketed redemptions [HKG-(CX)xDOH-(QR)xGRU-(JJ)AEP/EZE-(BA)oLHR-(CX)HKG]. I like to swap the CX HKG-DOH for the QR815 seats, and drop GRU-AEP please"
May: "You can't do that sir. I have to rebook your entire redemption with new availability."
Me: "No you don't. Reference [a redemption I had changed from HKG-(CX)oSYD-(CX)HKG to HKG-(CX)oSYD-(QF)oBNE-(QF)HKG]. You can see the cancellation and re-issue history on that one right? Did I have to book the CX HKG-SYD with new availability?"
May: "That redemption is an AM redemption. Your DOH redemption is OW"
Me: "Same cancellation and re-issue apply. I'm sorry I need to speak to your supervisor"
May: "Please hold"
May: "I'm sorry my supervisor is handling another call. But I spoke directly with ticketing. They said they can't detach your CX HKG-DOH. They will have to drop your QR DOH-GRU and JJ GRU-EZE as well"

I'm trying the Manila centre right now. I dunno is Tsuen Wan good for HKG-TPE-HKG redemptions only now....