Your expereince mirrors mine with Leica service. Absolutely useless and unfortunately makes buying their very tempting M10 a real risk in my eyes.
Another update: some may recall my bitching and moaning about the eight months my original 280/4 APO spent not being repaired at Leica Wetzlar for lack of parts only to return with a smashed rear cap. As suggested here, I sent this lens to DAG in late May. Today I received an e-mail from him describing the repairs and oh BTW the cost is (a very reasonable) $xxx. It took me less than five minutes to send the funds. Parts needed? Three screws.