I have had excellent customer service from a variety of dealers, distributors and manufactures. Rick Milam of A-V Design (ARC, Ayre, B&W, Vandersteen, Focale, etc) and Robert Bruce of Sound FX (Proac, Magnepan, Linn, NAD, etc) in Kansas City are dealers who are superbly knowledgeable and easy to work with. Jeff Catalano of High Water Sound in NY is an excellent purveyor of tubes and vinyl and one of the most helpful and candid audio experts I have encountered who guided me into a superb TW Acustic analog rig. Walter Swanbon of Fidelis AV in New Hampshire distributes Harbeth speakers and Perraux electronics and is one of the most friendly and knowledgeable audio experts I have met. Vinnie Rossi manufactures Red Wine Audio electronics in Connecticut and distributes WLM speakers and is as down to earth as one gets. Kevin Hayes designs and manufactures VAC amplifiers in Florida that are my current reference and he personally responds to all queries quite generously with his time.
The numerous poor customer service folks out there are discouraging but there are excellent suppliers in our audio community who are easy to work with and who will do everything they can to earn your business if you take the time to seek them out.
Hope this short list helps.