Based on the DOA tweeter and the speaker's damaged finish, it is my opinion you should immediately RETURN your Acoustic Zen Adagio speakers to Upscale Audio for a full refund. It is very unfortunate you had these problems but facts are facts. You paid good money for a product that was not delivered in an acceptable condition.
As you noted, you might be able to replace the tweeter but will it be properly balanced to the tweeter in the other speaker? I suppose the speaker could be returned to Acoustic Zen for refinishing but I suggest you not do it. For what ever reason, your speakers were not delivered in a pristine condition and should be immediately returned to Upscale Audio for a full refund.
As was noted above, if you ever decide to sell these speakers, you are going to have serious selling problems because of their unacceptable finish. The bottom line is the speakers were delivered in a damaged condition and you should NOT spend any more time having to get them repaired or even accept them in their damaged condition.
If Upscale Audio does not accept responsibility, then you should be protected by either your credit card or PayPal.
I suggest you call Upscale Audio and tell them you are returning the speaker for a full refund. I also suggest you send them an email (verify their correct address) followed up by a written letter of your intent to return the speakers (you need this in writing).
Several others above have also suggested you return the speakers. I am afraid that if you keep the speakers, you are not going to be happy regardless of any repairs made to the damaged speaker. I hope my above comments help.