- Edited
In the US, unordered merchandise is considered a gift. The lady that received the machine was in her legal right to keep it.
(b)Any merchandise mailed in violation of subsection (a) of this section, or within the exceptions contained therein, may be treated as a gift by the recipient, who shall have the right to retain, use, discard, or dispose of it in any manner he sees fit without any obligation whatsoever to the sender.
https://www.law.cornell.edu/uscode/text/39/3009
As far disputing charges, in my experience that would likely have made the situation worse. Invoking the law changes people’s behavior from cooperative to adversarial. They will follow the letter of the law and nothing more. It should only be used if the other party is already uncooperative (or your legal time period for dispute is about to expire).
Your contract was to deliver the machine to the lady’s house. They fulfilled that contract. Yes, they wrote the contract wrong, but you agreed to it. You would have likely lost the dispute. Your goal should be to keep ACS operating in good will.
Looking at how badly things could have gone for you, you are fortunate. The lady could have kept the machine. She didn’t. ACS could have told you to pound sand. They didn’t.
Mistakes suck. Unfortunately they happen. Reading about how ACS is handling this, I am very impressed.
Happy Thanksgiving