Is the "complementary maintenance" really worth it for the hassle you're dealing with? That's what you have to ask yourself. In the time you spend driving to the dealer you could be changing your own oil in your driveway or garage. It's painfully simple, inexpensive, and you have the satisfaction of knowing that your car is being 100% properly maintained. I'm sorry you're dealing with such incompetence at that dealer.
I stopped letting people change my oil the day I went into a shop and the mechanic "couldn't find the engine under the hood of my Fiero"
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Current: 2005 Porsche 911 Carrera S 6MT
Previous: 2 BRZ's, 997 C2S, C5 RS6, C4 S6, B8 S4, GDB STi, S30 240Z, FC3S RX-7 TII, AW11/SW20 MR2, E30 318is/325i, etc.