You literally went off by the fact that he claimed himself to be reputable without nothing to back it up, so, in smart people's mind, it was brilliant idea that you got scammed, because maybe and only then you'll learn valuable lesson from it, and also; you can easily do refunds yourself if you know how to; contact the customer support of said thing, be that amazon or something else, and come up with enough believable reason why the said item does not work, and tell them you want a refund after they speak to you about it.
Doesn't take another "refunder" to understand the simple context of it.