Lufthansa complaint: too expensive and too time consuming

Dear ladies and gentlemen,

since many years I buy – whenever possible – airtickets for Lufthansa (or at least Star Alliance) flights.
For my recent trip to Turkey I booked for my wife and me (see attached tickets) a flight DUS (LH 2005) – MUC (LH 9576) – ADB (LH 9577) – MUC (LH 2018)-DUS. Because all flights had Lufthansa codes I confidently assumed to fly Lufthansa or Star Alliance, just to learn in Munich, that Lufthansa has sold me a ticket for a cheap holiday airline (Sun Express) for a comparatively high price. Not only was the price too high, but additionally we lost app. 5 hours per flight due to the detour via Munich, because Sun Express also offers direct flights from Düsseldorf to Izmir.
My complaint:
1. Prize too high for the cheap holiday airline
2. Time loss of app. (in total) 10 hours, in order to simulate Lufthansa flights by the detour DUS – MUC and MUC – DUS.