Posted on another page but letting you guys know my experience.
Same thing happened on my account last year, I actually saved the link because it was on my Tesla Login page then kept going away. Anyways I would suggest to strongly stay way from upgrading the X to 75D from 60D, personally it is worth it on the model S as its only a 2k option but for the X it is soooo not worth paying $4500 for an upgrade you will hardly use. (Paid $6,600 Canadian after tax & USD conversion)
The only thing that was slightly worth it was my car was corked and by the battery upgrade I shaved a second after uncorking on my 0-60 time.
Currently charging a 60D to 100% will give you 60kWh to use, after upgrading my car only show'd 69 usable kWH but that is if you actually charge it to the 100% on the 75D. Now on my Remote Tesla app it is only showing 67.5 kWH usable on my Model X, not even a full 70 and never was a full 75.
If I currently charge to 90% I will only have 60.75wkh to use which is the exact same thing I had before the upgrade. Also charging to 100% on the 60D is way faster, getting that last 10wkh charged puts more stress on the battery and takes an additional 25 mins at the supercharger.
10000000% a SCAM in my opinion