My understanding with UPS is that the recipient can't make any address change, they will only allow the shipper to whom "contracted" with UPS to deliver the package on their behalf, and thus they are the only one UPS will allow to alter an address.
I had something similar happen years ago and UPS told me they could not accept the address correction from me, rather it must come from the shipper.
I explained to UPS what happen and was told they understand, but technically the package is still "owned" by the shipper/vendor until delivered to the address specified on the label. Make sense because the Vendor is the one that actual paid UPS to ship the package. Sure you paid the Vendor, but the Vendor is the one that directly paid UPS and not you.
The shipper/vendor was a bone-head and never followed it up with UPS and it got returned to them and then the Vendor tried to charge my credit card, shipping two ways + a re-stock fee for their mistake. Guess what the credit card company did.....refusal & charge-back of the entire transactions.
This is why insurance paid for by you the customer is a Joke, if the package is lost/damaged whatever, while the Vendor will *try* and tell you it's your problem because you didn't pay extra for insurance; it's not what the law says. Simply contact your credit card and provide them with the documentation and that charge to your account is gone.
Now if your shipping something yourself to someone, Yes by all means insurance it, because then you are the shipper and if somethings happens then you could be out the $$; but not the other way around.
Fox News Consumer Lawyer even did a spot on TV not long ago about this, and said flat out DON'T waste your money on paying extra for insurance on Ebay and any where else for that matter. It's one of the biggest misunderstandings and rip offs on the Internet these days.
So sum if up, sounds like WL was trying to get you to cancel your charge-back which then let's them off the hook and you then are out the money.......don't blame you one bit; I would never have done that either.
They made it sound like they didn't trust that you would cancel the dispute once they re-shipped the Laser, nice you trusted them with your money. Now as a customer though, they don't trust you. Very stupid of them, because after it got re-sent and signed & delivered to you, WL could easily have PayPal then throw out your claim; which I don't think would have even been necessary then.
As for the $100 return fee they refused to pay UPS, while it may seem foolish of them; to WL it's not really a $500 Laser anymore, it's a $100 liability, because it's China and while they happily charge us big $$$, I bet the return fee was more than WL really had "invested" in the Laser in the first place; thus the refusal.
Thanks for sharing, sadly doesn't look like too much has changed then.