Here's the bottom line with Guitar Center - and trust me - ALL of the Guitar Centers in Southern California, in my vicinity, and there's probably 5 or 6 of them, "know" me quite well ... and I honestly don't care...
IF you bought the keyboard "new", then, it should have come with:
- Keyboard
Manual
Power Plug
2 x music stand bracket inserts
1 x music stand
The box should have been "factory sealed", as well.
Since you did NOT receive these items, you are within your rights, to march that RIGHT back to them and demand a refund (NOT a store credit - they tend to like to LOCK you in to a store credit) ...
BEFORE you do that - You can tell them, "I'm bringing the keyboard back, I'm going to provide negative feedback on your store, I'm going to report your store to Guitar Center corporate, AND I'm going to report your store to BBB (better business bureau) for "Switch and Bait", and I might consider suing your store for age discrimination.
HOWEVER - before you do this, Yamaha isn't really going to help you .... "yes" they will probably send you the missing parts ... However, there's a bigger issue at hand ... The fact Guitar Center did this to you in the first place ... and I'm of the suspicion it's due to the fact that you aren't a young kid .... but, more of a "Young at Heart" individual ....
I take the approach - If I don't like it - It's going back. AND I "check" everything before I walk out of the store with it ... if it's missing something, I demand a "new" one ... In fact, I will process an "exchange" right then and there ... and if they don't like that ... then I simply process a full "refund" ... period ... and tell them, "No problem - I'll purchase it from Sam Ash, OR Amazon..."
In all honesty, they want your business ... No doubt ... especially at the price the Genos goes for ... So, it's not like they don't want it ... Problem is, they have "punks" that work in those stores, and frankly, could give a hoot about anybody else that is NOT LIKE them.
So - You still have some options here, if you are still within your 45 day return window.
IF they charged you full price - You could ask for a partial refund OR a 10 or 15% discount... and I would go to "Corporate" for this and NOT the store.
Write out what you want to say, and read your concerns to somebody who can actually help you out. Make your concerns known ... If you don't, GC will do this to others ... take advantage and keep doing it.
One more thing - You don't have to go to the SAME Guitar Center regarding this situation ... You can go to a different Guitar Center ... You might have better luck in getting their input ... and then, go back and tell the original guitar center you are making your rounds...
Don't let them stare you down - Bring somebody with you who you feel could be your confidant, and just let them know what's going on, and give them the background, so, if needed, they can step in and speak for you ... There's absolutely nothing wrong with having a Guido with you....
Any ways .... so sorry you are going through this Gloria ... Maybe by now all is worked out ... but ... this bugs me to no end....