Then you get to play the "how and why was it wrong" game. Was the image online wrong? Did the pick the wrong item? Did the UPC code mis-scan?
In my case, it seems like the manufacturer was sloppy and put two different incompatible versions in the same bag. The one I got wasn't even sold by that company. Possibly in a production line change switchover.
Just yesterday I wanted something from a Danish equivalent (Silvan). The website said the nearest store to me had 8 in stock, so there's little chance they'll be gone by the time I get there.
Many larger (and some smaller) shops have this.
https://www.silvan.dk/kram-spaendeskiver-rustfri-a2-m6-12-10... (click "Click and Collect" and it shows the stock levels. You can deny location access.)