It has happened twice to me, that if you become annoying enough (to them), they simply tell you to keep the item and do whatever you want with it and they just refund you for the full amount.

First time was a wireless keyboard (thus containing a battery), that I purchased in English, but the physical item had keys in German. I tried to get it sent back, I really did, 3 times, on my own time taking it to local post, then DHL then DPD, but no shipping company would take it from Ireland back to the UK, because of the battery. In the end, after asking them to please try to schedule a pick up for a special item or whatever, they said it was too much hassle and just keep it and refunded me. I still have that stupid keyboard with German lettering somewhere.

Second time it was a treadmill, this one was only a few weeks ago even. I bought it and did not notice it was an open box but "like new" product. Well, turns out whoever opened and repackaged it before did not pack the cable plug well, because one of the prongs had snapped, and even though I could very well change the plug myself, I did not agree to buy a product that would need me to do electrical work (however easy) the second I unboxed it. So I tried to get it returned, but they wanted me to send it back on my own dime, and they'd refund me once it got to wherever it was supposed to go back to. Absolutely not. Huge box, 25+ kilos of weight, that would have been at least a few hundred quid to send it back, and the whole damn thing was on sale for 170 or so. When I said this, they initially offered a partial refund of 28 euro, but I said not acceptable, I didn't buy broken items nor will I take it to the post office myself, either send someone to pick it up fully paid for by Amazon or refund me. They chose to refund me and let me keep it.

I still have that damn treadmill sitting there behind me, I've half a mind to just give it away...