No, if the goods are defective or were delivered incorrectly, you do not have to bear any costs for the return shipment. Please follow the normal return process as described on our website. You can create and print the required return label directly at https://spargut.com/en/my-account/ruecksendung/. Enclose the complaint form, which you will also receive as part of the returns process, with the product being returned.
You can also send an informal notice of withdrawal to widerruf@spargut.com. In this case too, we will bear the full cost of the return shipment.