You might consider sending them a link to the photos of the Soul Supreme they have on their website and point out that they did not ask you for permission to make a change from the product you thought you were buying. You might also point out that for them to resell the speakers, should you decide to return them, would cost them more than to send you the proper screws.
Soul Supreme | Zu Audio | Hi-Fi audio speakers and cables hand built in the USA
And you might point out that even their less expensive speakers do not have the cheaper looking phillips head screws they gave you.
Omen | Zu Audio | Hi-Fi audio speakers and cables hand built in the USA
Finally, I would be asking that Sean call you to explain why they are not honoring their 60 day guarantee promise which is to do everything possible to make their customers happy.
60-Day Guarantee | Zu Audio | USA Made Hi-Fi Speakers and Audio Cable
Soul Supreme | Zu Audio | Hi-Fi audio speakers and cables hand built in the USA
And you might point out that even their less expensive speakers do not have the cheaper looking phillips head screws they gave you.
Omen | Zu Audio | Hi-Fi audio speakers and cables hand built in the USA
Finally, I would be asking that Sean call you to explain why they are not honoring their 60 day guarantee promise which is to do everything possible to make their customers happy.
60-Day Guarantee | Zu Audio | USA Made Hi-Fi Speakers and Audio Cable