Disclaimer: I have received free gear from Mars, and am admittedly a fan, so this may carry less weight from me on that front.
Saying that, this isn't a warranty issue, the product works, it's just not the size you want. But it is the size you chose to buy. Now if it's different measurements, you can claim a refund due to misrepresentation. If you bought it online, you are covered by distant sales regulations and have 14 days to just change your mind. If you bought it in person, and sought advice on its suitability, then you can claim a refund due to it being unfit for purpose which you checked with the seller at the point of sale.
However, it sounds like you asked for an opinion from one sales agent, then went to another source, bought a product, waited longer than the 14 days, and then contacted someone you didn't buy it from, and asked them to refund you your purchase price.
I can see that you wanted a manufacturer to effectively sell the item to a retailer, at price A, let the retailer sell it at price A + B, and then give the end user, A+B money back. The retailer keeps B money and the manufacturer loses B.
I'm sorry man, but I just think you've gone about this entirely the wrong way. Not only isn't this a warranty claim, but you're asking for a refund from someone you didn't buy it from.
Saying that, this isn't a warranty issue, the product works, it's just not the size you want. But it is the size you chose to buy. Now if it's different measurements, you can claim a refund due to misrepresentation. If you bought it online, you are covered by distant sales regulations and have 14 days to just change your mind. If you bought it in person, and sought advice on its suitability, then you can claim a refund due to it being unfit for purpose which you checked with the seller at the point of sale.
However, it sounds like you asked for an opinion from one sales agent, then went to another source, bought a product, waited longer than the 14 days, and then contacted someone you didn't buy it from, and asked them to refund you your purchase price.
I can see that you wanted a manufacturer to effectively sell the item to a retailer, at price A, let the retailer sell it at price A + B, and then give the end user, A+B money back. The retailer keeps B money and the manufacturer loses B.
I'm sorry man, but I just think you've gone about this entirely the wrong way. Not only isn't this a warranty claim, but you're asking for a refund from someone you didn't buy it from.