[mothered]

Slightly confused but the wrong item method, wouldn't they notice I bought 2 headphones and I'd be paying for 2 headsets and only get a refund for one?

No.

You order a single headset and claim that they shipped something else Instead. That "something else", Is the wrong Item that (upon request), you'll send back. Because you didn't receive the headset (so they think), a refund will be Issued for the headset.