Unless I am missing something, you’re just saying they “didn’t charge you,” right? Then my suggestion is to go about things the same way you would in real life if you weren’t charged for an item at a retail store.
Like, if McDonalds didn’t charge me for a Big Mac, then sure, I’d walk back up to the counter - or even park my car and go inside if I was in the drive-thru - and let the cashier know they didn’t charge me.
But I’d try only as far as was appropriate for the transaction. Tell one employee, tell two. After a couple minutes if no one is interested in taking my five bucks… I’m out. It’s a Big Mac, not the keys to the franchise location, and they can take the hit, especially after I stood there and explained their mistake.
You’ve done your due diligence and told them you weren’t charged. I mean, I’d never, ever, ever suggest someone game the system or try to make off with something without paying… but there’s only so much you can do if you were “undercharged” or not charged at all despite attempting to pay.
I guess in McDonalds you could leave the fiver on the counter and walk out; no such option here. But there’s now documentation in the form of a ticket that they know you weren’t charged - and clearly they don’t have any intention of moving forward on this, especially since their data doesn’t match what you’re describing.
At the very, very most, I’d re-open the ticket and just make sure that they understand you have this gear, and you weren’t charged properly for it. Which I already believe that they understand.
And if there’s no further response, or if they come back again with “we don’t see that in our data,” then the highest moral option you could take… would be to delete the gear? I guess? Leave it in your bank, maybe, and don’t wear it?
You have multiple pieces of proof now (the original ticket, the response, this thread) that you tried to “pay.” No need to worry about someone coming out of the woodwork now and trying to kick up a fuss because you “didn’t pay.” But if you are indeed worried about that - or are just trying to make the deal square, for fairness - then delete or bank the gear as I suggested.
I dunno what else to say. You’re trying to pay, and you cannot pay, and you’ve told the “cashier” you haven’t been charged, and the cashier has said, “you didn’t even buy a Big Mac from us,” despite you clearly having one in your hand.
/shrug
You could wait for the possibility (no guarantee) than a Support Forum Agent chimes in on this, but you’ve done what you can, IMVHO. Good luck!