Every complaint letter to DFO should be copied to CAA. I was in a continental airline that had an unrealistic schedule. Night out & back to Africa. Lots of discretion & lots of complaints to DFO. No reaction. Company lost contract to a unionised airline. They proved the schedule was unrealistic and refused to do it. Contract returned to original airline with a few days night stop imposed by local AA; no discussion. Point was proven!
However, it brings more into light FTL's. 14hours, no time change, single sector. 15 hours rest; sounds OK. However, if the duty is at night that is something else. If it was a 0800 start finishing at 2200 and starting at 12.00; that's possible occasionally. (be there done that, except worse). However, a 14 hour night duty is not nice and needs more recovery time.
A captain is always allowed to act on own initiative due to Flight Saftey. Do So!