Oh yeah. Dark patterns abound on Amazon. It’s really not shocking that a honest person wouldn’t have found a way to get a full refund.
I’d the seller doesn’t make it easy, the buyer might need to talk a human at Amazon and/or file an A2Z guarantee claim or whatever they are called these days.
The system is setup to save Amazon as much money as possible and push people to being Prime members. Unhappy with the third party seller scamming you? You should bought a Prime subscription and only purchase things fulfilled by Amazon. /s