Last updated on July 22nd, 2019 at 12:12 pmHow to make a Complaint to Sirius XM Sirius XM provide a range of complaint handling options on their website. The first step is to phone the complaints line on 1-866-635-5027 / 1-866-635-2349 (Monday – Friday: 8 am – 10 pm EST, Saturday – Sunday: 8 am –