If you had come here and searched prior to purchase, you’d have known.
We do our best here.
As to next steps, Anker employees speaking under the Soundcore brand said their greatest source of customer feedback is Amazon, so if you bought it there, without venting just state it doesn’t support expandable storage and give an appropriate review score factoring it’s pros. It probably going to get noticed more there than here.
Remember to not vent as when I read a review with an obvious chip on shoulder I doubt their balance, so just be balanced fair and I’m sure it will do the most good.