frankly a partial refund and calling it good is to me even more dangerous. Are you absolutely sure two new tweeters are your problem? Sure the crossovers arent faulty/damaged? Have you asked yourself if the tweeters didnt magically both get damaged in shipping, what could have caused them both to fail? Are you certain that woofers weren’t damaged? Have you checked the output from the crossovers?
The moment you accept are partial refund, its your problem from there on, no recourse, no seller responsibility. Its your money but you are looking for an end to your problem when the course of action involving a partial refund may be just the beginning. We arent talking about addressing a cosmetic issue, they are inoperable and the solution you suggest is no guarantee it will be solved.