All tools can not be refunded, even the tool is a ...

All tools can not be refunded, even the tool is a garbage.
Before I paid, no one and no sign show me that tools can NOT be refunded, it's UNFAIRE!
Yes, finally I bought other stuffs, but those I don't need now. You can not refund to me. I bought two crimping tools, I used one, it has issue, so I want to return another that I never use it. But your casher was NOT nice, she did not trust me. If she open that package, she will find that tools is BRAND NEW.
By the way, If tools can not refund, why there is no sign or note in the store?