One thing you can try is the ox pack technique
First take a screenshot of the bow in you inventory with the name highlighted ... this is proof of ownership along with the confirmation of the Basher that sold it to you.
Next place the bow in an ox pack, close, load and unload and have a look at the bow. Since the "hunter" addition is not an enchantment per se but a recipe it may revert the bow to the newer one if this is a really old bow. Disclaimer - it could eat it too --
If you get the right bow back - great !
If it gets eaten or is still the same , post in grievances and disputes, you'll have the information from the screenshot to make your claim go faster.
As for the price... the lens is a guide only.. some things it prices too high and others far too low. The price you paid is fair for a bow you'll get a lot of use out of. IMO of course.