I can sort of imagine what you bought, though I haven't seen the actual ad. It sounds as if the seller is Chinese, even if the item is located in Australia.
Personally, I think you sound a bit cheeky, with a sense of entitlement, as far as the question of the cost goes.
Let me ask just one thing. Say you bought the item at $25 and the next week, you saw the seller had raised the price to $30. If the seller sent a note to say you should send him an extra $5 because he sold it too cheaply, would you feel obliged to?
No, I thought not.
The fact is, sometimes things do go on sale or sometimes you will buy an item by making an offer and you might find that someone else makes a lower offer and is accepted. That's life. It happens in real shops too and a seller isn't obliged to refund the difference.
So you were a bit cheeky to ask but hey, the meek don't always inherit anything and your effort paid off, the seller offered a $5 refund. You should have snapped it up. What you think the item is worth is not relevant because you agreed to the asking price, you weren't forced to buy.
The fact the item doesn't work as well as you hoped is disappointing but it doesn't make the item faulty.
Big difference.
Ebay covers you for items if they are broken when you receive them or if they are not the product you ordered and paid for.
Ebay and paypal won't cover you if the quality isn't up to what you were hoping for. They are not in the business of issuing guarantees about quality or any guarantee, come to that.
The bit about false statements. I understand where you are coming from. My own point of view is if an ad claims an item can do something and you find it cannot do that at all, then that is a misrepresentation.
Items are meant to be fit for purpose.
But if it can do what it was advertised to do-in your case I am imagining a spinning cleaner head-but the results aren't as wonderful or easy as you were hoping, then that is more about the quality of the product.
