Poor Customer Service

The best Customer Service is one that isn’t required.  Perusing this thread reveals a preponderance of complaints about streamers.  Since streamers are glorified computers , and therefore subject to all of the same network issues all IT has, this is not surprising.  I have never had an issue with an amp, speakers, CDP, or even turntable.  Until streamers came along, I never knew that Audio companies required Customer Service departments.
  My two worst experiences in CS were Sony and Arcam.  I never received any answer to phone calls, email, and certified snail mail.  Fortunately I was able to return the Arcam (thank you, Music Direct) but unable to return the Sony (eff you, Crutchfield).
  I had to deal extensively with CS with Bluesound and Bryston.  Bluesound CS went from being exemplary at first to very difficult over the years—I think they became to big for their own britches in sales volume.  Still, they ultimately resolved my issue.  Bryston is indeed excellent in support, I just wish the product itself didn’t require so much attention, and I am much happier since I sold it.
  My two current streamers are Melco and Cambridge Audio.  I have no idea what their CS is like because they work beautifully.

Like others above have noted, poor customer service makes me vote with my wallet and buy from others. 

In my experience, I've received excellent customer service from the following to name a few, in no particular order:  Ascend Acoustics, Rythmik, VPI (both Mat and Harry personally), Rogue Audio (Mark & Nick), Manley (EvaAnna), miniDSP, GIK Acoustics, Bob's Devices, Soundsmith, SweetVinyl, Herron, Oppo, Dr. Feickert, Brent Jesse, VTV amplifier, Music Direct, GIG Harbor Audio, Reference Analog, Audio Advisor
As to poor customer, the one that stands out to me as horrible is Emotiva - based on my experience with the UMC1 and how they handled the whole situation (complete lack of integrity).  Will never buy another Emotiva product and sold all of the pieces I owned.

Poor customer service is when they put you on hold and hang up on you.

Thanks for letting us know.

The thing is, even if you're swamped, and can't get good help,  it's trivial to auto-respond to say something like this:

"Thank you for your email, we are currently 1-3 days behind in email, we appreciate your patience and we'll get back to you at that time.  If this is an emergency, please contact the dealer where you purchased your magic_box"

And if you want to look really professional, for a handful of dollars (literally almost nothing), you can put in place a service where you take trouble tickets and then have technicians take a look at the tickets and get back to customers.
There's no excuse for bad service in the 21st century.   The tools are there to provide good service, they're cheap, and easy.