Are there any shipping costs for the returned item(s)?
If your return is due to an error on our part (e.g. if you have received a wrong or defective item etc.), Rosenberger OSI will pay all shipping costs. Otherwise, you must pay the costs for returns.
https://osi.rosenberger.shop/en/OSI-helpcenter/return/Are-there-any-shipping-costs-for-the-returned-item-s