Anything's possible... likely? No, it will take you millions of years to find a block on average. As for why they sell them to you, it's because it's easy to sell hardware to people who don't know what it is they're buying if the sales pitch is all bullshit.
I bought on Amazon UK, And sales pitch was that I could earn at least 25 bitcoin per month. If that's really not true I will raise an issue with Amazon
I seriously doubt that, bet that it actually said "
up to 25 bitcoins per month", which is in theory true.
Can you post the amazon listing? I find it hard to believe this happening to. I can't imagine anyone listing that way.
If so if you contact amazon I bet you could get money back. (Depending on time and if you believed it.. which is hard to believe anyone would believe). But amazon is very good on taking care of customers if listed wrong.