Yikes, I am very concerned about all of your issues Dan and no surprise that Amazon disavows any responsibility. That is their standard MO for these types of products. I also had some shipping damage and have ordered a replacement derailleur mount (not from Eahora). Mine is bent and the bike has never shifted properly (I only use 4 gears anyway). All else has been good and I'm up to 875 miles on the bike.
I feel fortunate to have had no other issues with the bike (X7+) but i keep waiting for the other shoe to drop. The electronics (motor, battery and controller) are my concern and with Eahora's AWOL customer service, finding replacement batteries and controller will be a challenge. The motor should be easier but the PAS feature will be the issue there.
With all the street/paved trail riding I've been doing, the back tire will need replacing soon. That should be easy but suggestions re 20" X 4" tires would be much appreciated.
Re the Rattan ebikes, I have three bikes (2 X, 1 XL) on order from them. At least there is a Facebook Users Group as that has improved communication. The Chief Engineer has been pretty responsive so I'm more optimistic about Rattan support but time will tell. Covid-19 seriously messed up Chinese ebike manufacturing and they are just now getting back on their feet. I hope Eahora gets their act together because the bike is basically a pretty good for the price. Just need replacements for the consumable parts.