Are You F***ing Serious?

Request that they look at the security video to see if they were activated. You can easily argue this.

THIS. Just like RahlsSolider said, they should be able to tell if the woman activated them. Also, did they give you a reciept. If not, then that's a major problem, especially in stores like Target.

Was this in the electronics department, or at the front checkout? The local Target here has the electronics registers in a circle, and certainly under camera watch.

Also, was the manager you spoke to the head manager of the store? Usually stores have several assistant managers, and one head manager who rarely makes himself seen.

Worse comes to worse, maybe try contacting Nexon (maybe try calling them, instead of using the worthless ticket system). I know that sounds really stupid, but never give up until you've tried every last option.