Issue buying from HiFiGo

I bought a pair of Kefine Delci AE, from HiFiGo.

I paid extra for fast delivery an it arrived on time (around 1 week). However, they have sent me the original Kefine Delci instead of the Delci AE.

This is frustrating as the original Delci is discounted and cheaper on their, site but I paid the higher amount for the AE as this is the one I wanted.

I've contacted their customer service via email today but I'm a bit concerned about how easy sorting this will be. For a start I know that the cost to return them will be high due to international shipping.

IMO they should be sending me the correct IEM for free and then covering any return costs. I'm wondering if anyone has had any experience with HiFiGo though, as I did not even receive a confirmation email when contacting their customer service.