All you can do is keep on at them about it. Are you the brand owner or a brand representative for the products? If so, make sure you're raising the cases through Brand Registry, not Seller Support.

If you don't have special brand permissions, you could try contacting the brand about it and see if they'll do anything to help.

Regardless of anything else, check to see what referral fee % you're being charged. I imagine they'll still count as accessories even in the Bike Glasses category, but on the off chance they're not, once fixed you'll want to then claim back the wrongly charged referral fees, so having the record at hand will be convenient.