A lot of tackle companies such as Shimano don’t allow their dealers to assess warranty claims, so taking or sending it back to the vendor doesn’t solve anything. Sure, the vendor could help you with a refund, but then they’re out for their cost and they’re not likely to get any satisfaction from the maker, as that’s most certainly stipulated in their dealer agreement.
When you buy products like that, you have to expect to deal with the makers warranty process, when there is a problem, not with the seller. That’s most likely spelled out on the warranty tag that came with the rod too.
Unfortunately, that rod could have very well have been nicked on the blank at any time, and there’s no way to tell when, or even how. Could have even been well before the vendor received it and it’s only going to be evident once someone uses it, which unfortunately was you folks. The only way that can be determined it send it to Shimano.
Back when most rods were made of fiberglass, this wasn’t such a problem, but these newer space age materials are not very forgiving of even the smallest nick. Which with warranties, is why the cost for repair or replacement runs up the price tag.
I’ve only ever had some inexpensive Shimano rods, bought years ago for two of my sons. They held up very well and if they had not, it would have been the same situation as tossing them and going to Walmart as they weren’t worth warranty work.
I don’t think that expressing your distain here is going to get your rod repaired or replaced either. The only choices it seems to me is to follow the warranty process if you so choose, or simply go and purchase a different brand rod, from another seller of your choosing.
Perhaps look into St Croix rods. They have various warranty levels and I’ve heard their customer service is far superior to Shimano’s. I’ve never had to deal with either.