Indeed. GE Customer service follow-up.  

I had been trying to get a GE service supervisor to contact me, and the callback name was Shane @ 605-388-4010 on my answering machine. I returned the call only to be advised that he would be 'out of the office' until August 12th.  Really poor service by General Electric for their hybrid water heater!!

Just as Darcy indicated above, 605-200-0000 is indeed a legit GE Customer service number - it's their South Dakota customer center number. However the number given above - 800-444-1845 does not take you to GE, but to Monogram Preferred Services. Monogram provided a number to GE Credit, who identified the SD Customer Service number as valid, but said that I'd have to call the SD number to straighten things out.

I tried. All I got was a voice recording that the mailbox is full.

We all seem to be getting so many obnoxious and bothersome calls.

This particular one is LEGIT.  It is a number for GE customer service.

Their call back number is 800-444-1845.

Got a call from a guy who identified himself as Brian with GE at the beginning of the call and said that he was returning my call and that Bridgett had taken the message.  I told him that I hadn't made a call today but maybe my husband had.  I told him that we had a service call for tomorrow.  At the end of the call he identified himself as Frank.  Weird.  So I called the this number back.  Of course no answer and the automated message said the voicemail was full.  Then I called back and the automated message said the voicemail box had not been set up yet.  Obviously not from GE

GE service dept