Generally, QR service fees vary by the market that is determined by the booking office you contact to. In my experience, main office in Doha still don't charge service fees for ticket changes, even after HK office started to charge those. I was able to avoid the 15€/80HKD ticket change service fee on one of my exHKG R/T tickets by calling directly to reservations in Doha, +974 4023 0000, instead of the local number. It's more expensive to call, but use voip service. At least also Nordics and US offices/lines have the service fees already introduced.