What if I encounter an issue with my item while it is under warranty? January 13, 2021 05:20 For any questions or issues about SIDIZ items you have purchased, please contact us through the Amazon seller message with your order number. Once we receive it, we will reach out to you as soon as possible. Related articles Is there a warranty on the items you sell? I think my item is refurbished (used). Is SIDIZ warranty valid worldwide? Where can I get the assembly and user guide? Even if I lock the tilt in the most upright position, it doesn't stop at 90 degrees. Is it defective?